Thursday, August 5, 2010

On The Rate of Wrongful Conviction: Chapter 3.3

As I have mentioned eight times previously, I am preparing a monograph on the rate of wrongful conviction. Each chapter will deal with one estimate of that rate, beginning with zero and ending beyond 10%. I am posting the draft chapters here, as I write them.  I have so far posted the following: 

Chapter 0.027: The Scalia Number
Chapter 0.5: The Huff Number
Chapter 0.8: The Prosecutor Number
Chapter 1.0: The Rosenbaum Number
Chapter 1.3: The Police Number
Chapter 1.4: The Poveda Number
Chapter 1.9: The Judge Number
Chapter 2.3: The Gross Number

Now, for the last time, we come in beneath the 5% barrier. Hang in there while reading this longish post. There's good stuff at the bottom.


Chapter 3.3
The Risinger Number

In his paper “Innocents Convicted: An Empirically Justified Factual Wrongful Conviction Rate”, Michael Risinger claims to be the first person to determine a wrongful conviction rate by dividing a number of exonerations by an appropriate number of convictions.
To a great extent, those who believe that our criminal justice system rarely convicts the factually innocent and those who believe such miscarriages are rife have generally talked past each other for want of any empirically justified factual innocence wrongful conviction rate. This article remedies at least a part of this problem by establishing the first such empirically justified wrongful conviction rate ever for a significant universe of real world serious crimes: capital rape-murders in the 1980s.
Risinger then points out in a footnote that he wasn’t actually the first, having lagged Professor Ledewitz by 19 years.
Prof. Ledewitz recounted that he had examined the first hundred cases of execution under the restored death penalty and found four convicts (identified by name) whom he regarded as having “significant claims of innocence.” Again, the methodology is exceedingly soft, but the 4% resultant is not very different from that arrived at in this study.
Risinger also seems to be unaware or have lost track of Marty Rosenbaum’s 1991 paper “Inevitable Error: Wrongful New York State Homicide Convictions, 1965-1988”, the basis for Chapter 1.0 of this work.

Furthermore, Risinger seems to be unaware of or have lost track of Tony Poveda’s 2001 paper “Estimating Wrongful Convictions,” the basis for Chapter 1.4 of this work.

Finally, Risinger seems dismissive of the work of those who derive wrongful convictions rates from judge-jury agreement data, such as Professor Bruce Spencer of Northwestern University whose work will be discussed soon in Chapter 10.0.

So according to my counting, Risinger’s paper is no less than the fifth paper attempting to define an empirically-based wrongful conviction rate. Risinger’s paper is the first I have seen, however, to clearly describe his work as finding a proper numerator and denominator.
Using DNA exonerations for capital rape-murders from 1982 through 1989 as a numerator, and a 407-member sample of the 2235 capital sentences imposed during this period, this article shows that 21.45%, or around 479 of those, were cases of capital rape-murder. Data supplied by the Innocence Project of Cardozo Law School and newly developed for this article show that only two-thirds of those cases would be expected to yield usable DNA for analysis. Combining these figures and dividing the numerator by the resulting denominator, a minimum factually wrongful conviction rate for capital rape-murder in the 1980s emerges: 3.3%.
Unlike Samuel Gross, just discussed in Chapter 2.3, Risinger limits his analysis to rape-murder capital cases in which DNA turned out to be available post-conviction. Risinger also used a narrower range of years than did Gross, and together these differences presumably account for the difference in their estimates.

For his numerator, Risinger used the 11 DNA exonerations for that time frame reduced by one-half of an exoneration to account for the possibility that one in twenty of those people exonerated might be factually guilty.  For his denominator, Risinger used the 2235 capital sentences for that same time frame, multiplied by 21.45% to account for the fraction which were rape-murder convictions, multiplied by 2/3 to account for the fraction which had usable DNA for analysis. His math presumably looked something like:

(11 - 0.5) / (2235 x .2145 x .667) = 0.0328 = 3.3%

Risinger declared that number to be the lower limit for wrongful murder-rape capital cases, suspecting that DNA data had not been examined in all cases where it was available, but had been examined in at least 50% of those cases where it was available. He offered no data to back up those assumptions. He simply used them to argue the actual rate is closer to 5%:
It would be quite surprising, perhaps even shocking, if capital post-conviction counsel had failed to request DNA testing in anything close to half the 319 capital rape-murder cases in the reference set. Additionally, even in these cases, it is likely that the requests, if not universally made, would be skewed toward being made in the otherwise more factually questionable cases. So I believe we can conclude without much doubt that the ceiling is not double the floor (which would give a maximum ceiling figure for actual innocence of 6.4%), but is in fact substantially less. I believe it is fair to put a reasonable maximum under these circumstances at around 5%.
Risinger then discussed the possible extension of his number to crimes other than capital rape-murder cases.  For this he used words rather than a numerator and a denominator, and Ronald Allen called him on it in “Deadly Dilemmas.”
Michael Risinger's study examines error rates in capital rape-murder trials between 1982 and 1989. Risinger concludes that the error rate of false convictions ranges conservatively somewhere between 3.3% and 5%. The numerator comes from fairly convincing DNA exonerations in the set of capital rape-murder cases during the period, and the denominator is the set of capital rape-murder convictions during the same period. Risinger then considers extrapolating this error range to rapes, capital murders, and non-capital murders "manifesting particular callousness or brutality analogous to capitally sentenced murders," finding "no good reason for believing" that the rates would be much different.

But there are powerful reasons to think that the error rates might be different. Risinger's entire sample involved trials, yet most criminal charges are resolved by pleas. … Thus, an accurate error rate for capital rape-murder cases should reflect that data. Risinger makes the striking claim that the rates of error in plea-bargained cases could be as high as errors at trial. Such an unsubstantiated and highly improbable proposition stands in stark contrast to the commendably empirical cast to his article. Unless the frequency of false confessions is as high as the frequency of false convictions (and that appears implausible on its face), the error rate at trial cannot simply be hypothesized as the error rate of pleas.
“[Y]et most criminal charges are resolved by pleas.”  There’s the rub. Approximately 95% of all convictions result from plea bargains, not trials. That’s why so many prosecutors claim to have a 95% conviction rate. It has almost nothing to do with their performance before a jury.

So while the 95% plea bargain percentage works out fine for prosecutors, it is troublesome for those empiricists who estimate wrongful conviction rates from a small subset (DNA exonerations) of a small subset (capital rape-murder trials) of all convictions (most of which were plea bargains.) The plea bargain issue is of such magnitude that it places justice and injustice in the hands of prosecutors far more so than  in the hands of jurors. If there is a significant wrongful conviction rate in this country, it is due almost entirely to the failings of prosecutors.

Just as Michael Risinger dismisses the problem with a verbal slight of hand, so does Ronald Allen. Michael Risinger finds “no good reason for believing” the wrongful conviction rate of plea bargains would be much different than that of jury trials. Ronald Allen declares such a proposition “implausible on its face.”

Since Michael Risinger and Ronald Allen seem to be squabbling, and since the wrongful conviction rate for this country cannot be understood without understanding the wrongful conviction rate associated with plea bargains, I therefore hope, later in this work, to remedy “at least a part of this problem by establishing the first such empirically justified wrongful conviction rate ever for a significant universe of real world” plea bargains.

For now, I suggest the two combatants consider the instances of mass exonerations as evidence that innocent people are easily and frequently persuaded to confess and/or plead guilty to crimes they did not commit. Consider first the case of the Central Park 5.

The Central Park Jogger case involved the brutal assault, rape, and near murder of Trisha Meili. On April 19, 1989, the 28-year-old Meili was jogging through Central Park at night. She was attacked and left for dead, discovered 4 hours later suffering massive blood loss, internal bleeding, severe hypothermia, multiple lacerations, and a skull fracture so severe one eye was displaced from its socket. She was not expected to live, but she did. Today she still suffers from some loss of vision and balance, but has made a career as a motivational speaker.

After being arrested and interrogated, 5 black youths confessed to the crime, 4 of them confessed a second time while being recorded, each implicated the others, then all recanted. Though their confessions contradicted the forensics and the other confessions, and though DNA taken from the victim was from a single male other than any of those who had confessed, all 5 youths were convicted by juries, based primarily on their confessions.

In 2002, after the statute of limitations had expired, an inmate serving a life sentence for rape confessed to the crime, and he had the DNA to back it up. He was soon linked to 8 other rapes in a seven-month-period prior to the Central Park rape, including one in Central Park just two days earlier.

The 5 youths were all exonerated, though they had each already served their sentence. Despite Ronald Allen’s claim that it is "implausible on its face" that people would confess in substantial numbers to crimes they did not commit, all 5 confessed under conditions appellate courts found acceptable, conditions police defend as appropriate to this day.

If 5 false confessions in a single case are insufficiently plausible, consider the Tulia 42. Tulia is a small town in Texas not far from Amarillo. In 1999, authorities rounded up 46 citizens, 40 of whom happened to be black. Those 40 were represented approximately one-third of Tulia’s black male population. From Wikipedia:
All charges were based on the word of undercover officer Tom Coleman, a so called "gypsy cop" who made his living traveling through impoverished rural Texas offering to work undercover cheaply for short periods of time for under-funded police departments. Coleman claimed to have made over one hundred drug buys in the small town. He never recorded any of the sales, but claimed to have written painstaking notes on his leg under his shorts and upper arm under his shirt sleeve when nobody was looking.

During the roundup, no large sums of money, illegal drugs, drug paraphernalia, or illegal weapons were found. The accused drug dealers showed no signs of having any income associated with selling drugs. The drugs Coleman claimed to have bought from the accused did not have the fingerprints of the accused on them or their baggies. No independent witnesses could corroborate Coleman's claims. In his testimony, Coleman gave inaccurate descriptions of the "dealers" he had allegedly bought cocaine from. One suspect had his charges dropped when he was able to prove he had been at work during the times he had supposedly sold Coleman cocaine. Another produced bank and phone records indicating she was in Oklahoma City, Oklahoma at the time of her alleged crime. Many of the accused, however, seeing the long sentences dealt by all-White juries in earlier cases, pleaded guilty in return for lighter sentences, despite their proclaimed innocence. The remaining defendants were convicted solely on the basis of Coleman's testimony. John Cornyn, the state attorney general [and now a US Senator], awarded "Lawman of the Year" to Coleman.

Amarillo civil rights attorney Jeff Blackburn began investigating the Tulia defendants' cases along with civil rights organizations and a handful of attorneys from firms around the country. Eventually the case became a cause célèbre, and money was raised to legally challenge the cases. Many had already served several years in prison before this process gained momentum. By 2004, Blackburn and his team had freed most of the "Tulia 46" and a $6,000,000 collective settlement was reached to avoid further litigation in civil court.
More specifically, and more to the point being made herein, twelve of those arrested faced jury trials, were convicted and received sentences of 20 to 99 years. Thirty pleaded guilty out of fear of what jurors would do. As implausible as it may seem to Ronald Allen that anyone would plead guilty to a crime they didn’t commit, it seems that 30 out of 46 apparently did so in Tulia. That’s a 65% wrongful plea bargain conviction rate.
Ronald Allen might consider also the Dallas Sheetrock Scandal. At least 80 low-income, Mexican-American defendants were charged with possession of crack cocaine, based on the claims of a confidential informant paid $200,000 for his service to the community. Many of the defendants pleaded guilty before the cocaine was finally tested. It turns out that, by some strange coincidence, the cocaine in each case was not cocaine at all; it was gypsum powder, the primary constituent in sheetrock wallboard. Defense attorneys claimed prosecutors threatened to substantially increase the prison sentence being offered in return for a guilty plea if the defendant demanded the “cocaine” be tested.

In Hearne, Texas, the district attorney offered to drop charges pending against an informant if that informant would produce information leading to 20 drug arrests. The informant went above and beyond, providing information leading to the arrest of 28 people, all black, all for small-time drug sales. It all came unglued when one person refused to plead guilty and insisted on a trial. The district attorney dropped charges against that person and the other 16 who had not yet pleaded guilty. With respect to the 11 who had already taken a plea, the DA said “I don’t doubt one minute their guilt in dealing drugs.” The DA apparently finds it implausible that anyone would plead guilty to a crime they did not commit. Assuming the 11 who pled guilty were in fact innocent, as we have every reason to suspect, that’s 11 false pleas out of 11 convictions, a 100% false plea bargain conviction rate.

Out in Los Angeles, matters are no better. In September 1999, the Rampart Scandal exploded. From Wikipedia:
More than 70 police officers in [an anti-gang unit] were implicated in misconduct, making it one of the most widespread cases of documented police misconduct in United States history. The convicted offenses include unprovoked shootings, unprovoked beatings, planting of evidence, framing of suspects, stealing and dealing narcotics, bank robbery, perjury, and covering up evidence of these activities. … As a result of the probe into falsified evidence and police perjury, 106 prior criminal convictions were overturned.
Other estimates place the number of trumped up cases as high as 150. The great majority of those framed were young Hispanic men who ended up pleading guilty to false felony gun or drug charges.

I am not arguing that these cases of mass exoneration are representative of the criminal justice system. I hope they are rare exceptions. I do argue, however, they provide evidence that out of any select group of people, many can be compelled to confess or plead guilty to crimes they did not commit, as implausible as that may seem.
<<>>

In summary, Michael Risinger calculated a wrongful conviction rate of 3.3% for capital rape-murder convictions. He then suggested that this rate might be applicable to other types of crimes, and perhaps even to plea bargains. Ronald Allen took scholastic umbrage and declared Risinger’s extension “implausible on its face.” I took blogger umbrage at Allen’s response. I offered Allen, my lastnamesake, examples of wrongful plea bargain convictions in an effort to convince him they are plausible. I made the bold claim that I will, in this work, become the first person to provide an empirically-based estimate of the rate of wrongful plea bargain convictions.

Notes:
1. “Innocents Convicted: An Empirically Justified Factual Wrongful Conviction Rate,” by D. Michael Risinger was published in The Journal of Criminal Law & Criminology, Volume 97, Number 3, in 2007; Copyright © 2007 by Northwestern University School of Law

2. At the time “Innocents Convicted” was published, D. Michael Risinger was a Professor of Law at Seton Hall University School of Law. Since 2008, he has been the John J. Gibbons Professor of Law at Seton Hall University School of Law.

3. “An Essay Concerning Judicial Resignation and Non-Cooperation in the Presence of Evil,” by Bruce Ledewitz, 27 Duquesne Law Review 1(1988).

4. When I write of Ronald Allen, I refer to both Ronald J. Allen and Larry Laudan.

5. “Deadly Dilemmas,” by Ronald J. Allen and Larry Laudan, 41 Texas Tech Law Review 65 (2008).

6. At the time “Deadly Dilemmas” was published, Ronald J. Allen was the John Henry Wigmore Professor at Northwestern University School of Law, a position he still holds today.

7. At the time “Deadly Dilemmas” was published, Larry Laudan was Senior Investigator and the Instituto de Investigaciones Filosóficas, Universidad Nacional Autónoma de México.

8. Just as I thought Samuel Gross’s 2.3% number is far too low, I believe Michael Risinger’s number is far too low. I will make my case in Chapter 12.6.

Monday, August 2, 2010

Lamont Reese Speaks From the Grave

This summary is not available. Please click here to view the post.

Saturday, July 31, 2010

The Slam Dunk Case of Charles Anthony Boyd

In my search for the 54 innocent people I calculated Texas may have executed, I passed Charles Anthony Boyd through my coarse filter for two reasons. First, he used his final breaths to declare his innocence. I quote from the August 6, 1999 edition of the Laredo Morning Times:
Boyd initially declined to make a final statement. But, as the drugs began flowing into his arms, he said, “I want you all to know I did not do this crime. I asked for a 30-day stay for a DNA test so you know who did the crime.” Then he gasped and slipped into unconsciousness.
Second, the folks at Northwestern had listed him a someone possibly innocent but certainly executed. I trust the folks at Northwestern so I allowed Boyd through my coarse filter. I include the Northwestern list below, limiting it only to those people executed by Texas, adding my Actual Innocence Score for those cases I have already reviewed.
Odell Barnes, Jr., 69
James Beathard
Charles Anthony Boyd
David Castillo
Clyde Coleman
Robert Nelson Drew, 84
James Otto Earhart
Tony Farris
Gary Graham (aka Shaka Sankofa), 58
Jerry Lee Hogue
Jesse Jacobs
Carl Johnson
Richard Wayne Jones
Davis Losada
Robert Madden
Justin Lee May
Frank Basil McFarland
Charles Rector
Kenneth Ray Ransom
David Stoker
Martin Vega
Charles Anthony Boyd was executed on August 5, 1999 for one of the so called North Dallas “bathroom slayings.” Again from the Laredo Morning Times story.
Boyd was condemned for strangling and drowning 21-year-old Mary Milligan at her apartment [on] April 13, 1987. A recent Texas Tech University graduate, she had moved to Dallas to take a job as a bank management trainee. Boyd was arrested the day after Ms. Milligan’s murder when jewelry and other items taken from her apartment were pawned. The former bank janitor lived across the hall from her.

He also became a suspect after detectives learned of his past. Boyd had previous convictions for burglary and sexual assault and had been released from prison in November 1985 after serving less than half of a five-year sentence. …

In July, Tippawan Nakusan, 37, who lived upstairs from Boyd and worked as a waitress, was found stabbed and suffocated in her bathtub. That September, Lashun Chappell Thomas, 22, a nursing home aide, was found fatally stabbed and in a bathtub in the apartment complex. Then Ms. Milligan was killed in similar fashion at an apartment complex where Boyd lived. …

After his arrest, Boyd confessed and was charged with all three slayings but tried only for Ms. Milligan’s killing. Besides tying him to items taken from the apartment and his confession, prosecutors also had forensic evidence from Ms. Milligan’s apartment to link him to her death.
And that’s about it. I found very few stories about Charles Anthony Boyd. Nothing to tell me that his initial confession was coerced, that the forensics (whatever they were) were bogus, that his conviction was based on the purchased testimony of a snitch, that the real culprit had later confessed. Instead I found out that his appeals were based on a claim that he was mentally retarded and should therefore not be executed. From the ruling by the 5th Circuit Court of Appeals:
Defendant Charles Anthony Boyd was convicted of capital murder and sentenced to death. He requests a Certificate of Probable Cause ("CPC") to appeal the district court's denial of his petition for habeas corpus under 28 U.S.C. § 2254. He contends that the district court erred because (1) counsel was ineffective for failing to present mitigating evidence of his retardation to the jury at sentencing; (2) the jury was prevented impermissibly from giving mitigating effect to evidence of his retardation and his positive character traits; (3) the failure to instruct the jury on the parole implications of a life sentence in a capital case rendered the Texas sentencing scheme unconstitutional; and (4) the admission of extraneous offenses at the sentencing phase violated due process and the Eighth Amendment. We deny Boyd's request for a CPC.
I found no other appeals in Google Scholar, nothing indicating that Boyd didn’t actually kill Milligan. I did find a plea from Amnesty International to not execute Boyd, because he was mentally retarded.
Charles Boyd, black, is scheduled for execution in Texas on 5 August 1999 despite evidence that he is mentally retarded. He was sentenced to death in November 1987 for the capital murder of Mary Milligan, white.

At Boyd’s trial his defence lawyers failed to investigate and present evidence of his mental retardation because they did not recognize that he might have such a problem. Although a prison report was available which stated that in 1983 Boyd’s IQ had been measured at 67 (an IQ under 70 is considered to signify retardation), both lawyers have since stated that they do not remember seeing this or other evidence that Boyd was suffering from retardation. As a result, they did not have Charles Boyd examined by any mental health professional. The appeal courts have ruled that this did not amount to ineffective defence representation.

In 1995 a federal court ordered a hearing into this claim of inadequate counsel. At the hearing, a magistrate heard evidence of Boyd’s mental retardation, including expert testimony from a psychologist and a neuropsychologist who had conducted evaluations of Boyd, and interviews with his family members, in 1992. At the hearing the court heard that Charles Boyd had displayed signs of having learning difficulties from early childhood. His mother did not enroll him in Special Education Classes as advised because she was “embarrassed” to do so. Charles’s nickname was “head” because he would regularly beat his head against walls and on the ground to receive attention. Charles was allegedly subjected to regular beatings by his stepfather and brother, often because the young boy was “slow” to respond to requests. It was only at the age of seven that it was discovered that he was deaf in one ear. Charles also suffered from seizures throughout childhood. [Emphasis mine.]
Without a claim of actual innocence, Charles “Head” Boyd didn’t stand a chance. In 1989, the US Supreme Court ruled that it was not unconstitutional to execute a mentally retarded person. Though 12 states had by then forbidden the execution of a mentally retarded person, Texas was not one of them. Indeed, Texas had rejected a law banning such executions just three months prior to Boyd’s execution.

Without a claim of actual innocence, I won’t even prepare an Actual Innocence scorecard for “Head.” Instead, I will arbitrarily score him at 0.01. I refuse to give him a zero given that he spent his last gasp claiming he was innocent. It seems to me as if there is more to this story, and I simply can’t find it from an easy chair in my living room. It disappoints me in several regards.

Friday, July 30, 2010

On The Rate of Wrongful Conviction: Chapter 2.3

As I have mentioned seven times previously, I am preparing a monograph on the rate of wrongful conviction. Each chapter will deal with one estimate of that rate, beginning with zero and ending beyond 10%. I am posting the draft chapters here, as I write them.  I have so far posted the following: 

Chapter 0.027: The Scalia Number
Chapter 0.5: The Huff Number
Chapter 0.8: The Prosecutor Number
Chapter 1.0: The Rosenbaum Number
Chapter 1.3: The Police Number
Chapter 1.4: The Poveda Number
Chapter 1.9: The Judge Number

Now, for the first time, we break the 2% barrier. The numbers will begin to climb rapidly after this post.


Chapter 2.3
The Gross Number

In December 2008, Samuel Gross wrote:
Since 1973, 128 U.S. criminal defendants who were sentenced to death have been exonerated. This is a startlingly high number … Most likely, this extraordinary number of capital exonerations is caused in part by a higher underlying error rate among capital convictions and in part by a higher rate of detection of those errors after conviction. It is well known that more resources are devoted to capital defense than to other cases, before and after conviction, but it is hard to believe that better review alone explains the capital exoneration rate. If that were the whole story, it would mean, for example, that if we had reviewed prison sentences with the same level of care that we devoted to death sentences, there would have been approximately 87,000 non-deathrow exonerations from 1989 through 2003 rather than the 266 that were reported in a comprehensive study in 2005.
Gross realized he could compare capital murder exonerations to capital murder convictions to determine a wrongful conviction rate, at least for capital murder. All he had to do was divide the number of exonerations by a properly related number of convictions and, voila, a wrongful conviction rate. He wasn’t going to simply guess, or have others guess for him. He was going to find a good numerator and a good denominator and he was going to divide.

Gross knew, however, he had to be careful in his selection of both the numerator and the denominator. He was careful to include in his numerator only those people who were likely to be factually innocent. He intentionally excluded those who might have been removed from death row for technical reasons, those who were merely re-sentenced, and those who were re-tried and found guilty once again.
As we use the term, “exoneration” is an official act -- a pardon, a dismissal, or an acquittal -- declaring a defendant not guilty of a crime for which he or she had previously been convicted … Very likely, however, some defendants we count as “exonerated” did in fact participate in the crimes for which they were convicted. In our estimation, the probability of innocence is high for all of these exonerated defendants -- for many, innocence is beyond dispute -- and the number of misclassifications low enough to make these exonerations a useful proxy for innocence. … And, of course, the set of exonerated defendants does not include innocent defendants who were executed, nor those who remain on death row, nor the undetected innocent defendants among the thousands of defendants who have been removed from death row but remain in prison.
He was also careful when he selected his denominator. He realized he couldn’t simply divide all exonerations by all convictions because exonerations don’t happen overnight.
[W]e know that 7,534 people were sentenced to death from 1973 through 2004. In the same period, 111 defendants were exonerated after being sentenced to death for murder under a post-Furman capital sentencing statutes, or 1.5 percent of all death sentences.

That figure -- 1.5 percent -- is not the final word on exonerations for the cohort of defendants who have been sentenced to death since 1973, let alone a reasonable estimate of the rate of false capital convictions. As time passes, some defendants in this group who have not yet been exonerated will be.
To account for the lag between conviction and exoneration, Gross realized that most exonerations (95%) occurred within 20 years of conviction. He would therefore make sure his denominator accounted for that 20 year lag. He would divide all the exonerations from 1973 through 2004 (54) by all the convictions from 1973 through 1984 (2,394) to arrive at a wrongful conviction rate of 2.3 percent.
Of the post-Furman death row inmates who were exonerated between 1973 and 2004, 95 percent had been freed within 20 years of their conviction (106/111). Overall, 2,394 death sentences were pronounced in U.S. courts from 1973 through 1984. By 2004, the process of identifying exonerations for these 20 to 30-year-old death sentences was largely complete. It resulted in 54 exonerations -- almost exactly half of all capital defendants who were exonerated through 2004 -- or an exoneration rate of 2.3 percent (54/ 2,394).
He checked his number by assuming a 15-year lag instead of a 20-year lag.  He ended up with the same number: 2.3 percent.
Eighty-one percent of capital exonerations occurred within 15 years of sentencing (90/111). By the end of 2004 there had been 86 exonerations among the 3,792 capital defendants who had been sentenced to death through 1989, at least 15 years earlier, also an exoneration rate of 2.3 percent Two additional defendants who were sentenced to death before 1990 were exonerated in 2005, but judging from the pattern of previous cases, we have probably seen almost all the capital exonerations that we will see for defendants sentenced to death through 1989.
He naturally concluded that he had arrived at a good estimate of the wrongful conviction rate, at least for capital murder trials in the United States.
In other words, a good estimate of the long-term … capital exonerations rate in the United States is 2.3 percent.
Solid as his math seems to be, I disagree with Samuel Gross on this number. I will await Chapter 11.3 to make my case.


Notes:
1. When I write of Samuel Gross, I write actually of Samuel R. Gross and Barbara O’Brien. Together they wrote “Frequency and Predictors of False Conviction: Why We Know So Little, and New Data on Capital Cases”, Journal of Empirical Legal Studies Volume 5, Issue 4, 927-962, December 2008

2. At the time their article was published, Samuel Gross and Barbara O’Brien were Assistant Professors of Law at Michigan State University College of Law.

3. Gross and O’Brien recognize that the wrongful conviction rate for capital murder cases is not necessarily equal to the rate for all cases. They are careful to limit their conclusion to capital murder cases. “All things considered, we believe that 2.3 percent -- the long-term rate of exoneration of death row inmates -- is a conservative estimate of the rate of wrongful death sentences.”

Wednesday, July 28, 2010

On The Rate of Wrongful Convcition: Chapter 1.9

As I have mentioned six times previously, I am preparing a monograph on the rate of wrongful conviction. Each chapter will deal with one estimate of that rate, beginning with zero and ending beyond 10%. I am posting the draft chapters here, as I write them.  I have so far posted the following: 

Chapter 0.027: The Scalia Number
Chapter 0.5: The Huff Number
Chapter 0.8: The Prosecutor Number
Chapter 1.0: The Rosenbaum Number
Chapter 1.3: The Police Number
Chapter 1.4: The Poveda Number

I am now back on track posting the draft chapters in monotonically increasing order. It's another survey number, the last for a bit. It does have some interesting new information at the bottom, regarding feeback on what an acceptable level might be


Chapter 1.9
The Judge Number

The Ramsey Ohio survey study introduced in Chapter 0.8 was so comprehensive that it allows me to determine four separate wrongful conviction estimates: one each for prosecutors, police, judges, and defense attorneys. The prosecutors were the most conservative in their estimate, guessing that the wrongful conviction rate for the country is 0.8%.  The police were the next more conservative group, guessing that the wrongful conviction rate for the country is 1.3%.

The third most conservative group within the Ramsey survey was the judges’ group. Regarding the survey question at hand, Ramsey received responses from 153 judges. Their responses are categorized below.


I will define the Judge Number for the wrongful conviction rate in the same manner I defined the Prosecutor Number: I’ll determine the median judge guess at the wrongful conviction rate using a plot. That plot is presented below. Based on the plot, I claim the single best number to represent the wrongful conviction rate estimated by the Ohio judges responding to the Ramsey survey is 1.9%.


Consider the significance of the Judge Number. If it is applicable to all 2.5 million people we have incorporated, it suggests that even the judges believe we have 47,500 people wrongfully incarcerated in this country today.

<<>>

As mentioned in the earlier chapter dealing with the Ramsey survey, I noted that Ramsey was clever enough to ask for separate guesses of the wrongful conviction rate: one for the country as a whole and one for the respondent’s jurisdiction. It’s interesting to compare the two.

For the judges, the national median guess was 1.9%, as just reported. For that same group of judges, the median guess for their jurisdiction was 0.56%. On average, the judges believed the wrongful conviction rate in their jurisdiction was somewhat more than one-half that of the national average. This makes the judges slightly less delusional than the police or the prosecutors.

For comparison, the numbers for police are 1.3% and 0.2%; that’s a factor of one-sixth. The numbers for prosecutors are 0.8% and 0.2%; that’s a factor of one-fourth.

<<>>

Ramsey was also clever enough to ask his respondents their opinion of an acceptable wrongful conviction rate. Slightly more than half the judges and police felt the acceptable rate was zero. Slightly fewer than half the prosecutors felt the acceptable rate was zero.

Good for all of them. While no one is arguing a zero rate is achievable, it’s good that half of all police, prosecutors, and judges feel a wrongful conviction is an unacceptable circumstance. Perhaps they would be willing to help free some of the 20 to 50 thousand people they estimate are now wrongfully imprisoned.

At the other extreme, one prosecutor and four judges thought 5% would be an acceptable wrongful conviction rate.

Three police respondents also thought 5% was an acceptably-low wrongful conviction rate. Four police respondents thought 10% would be acceptable. Two of them thought 15% would be okay. Astoundingly, one police respondent thought that a wrongful conviction rate of 20% was not too high.