Last year, a study I co-authored on the issue was published in the Proceedings of the National Academy of Sciences. It shows that 4.1 percent of defendants who are sentenced to death in the United States are later shown to be innocent: 1 in 25.
Death sentences are uniquely well-documented. We don’t know nearly enough about other kinds of criminal cases to estimate the rate of wrongful convictions for those. The rate could be lower than for capital murders, or it could be higher. Of course, in a country with millions of criminal convictions a year and more than 2 million people behind bars, even 1 percent amounts to tens of thousands of tragic errors.
The problem may be worst at the low end of the spectrum, in misdemeanor courts where almost everybody pleads guilty.
Why then did they plead guilty? As best we can tell, most were held in jail because they couldn’t make bail. When they were brought to court for the first time, they were given a take-it-or-leave-it, for-today-only offer: Plead guilty and get probation or weeks to months in jail. If they refused, they’d wait in jail for months, if not a year or more, before they got to trial, and risk additional years in prison if they were convicted. That’s a high price to pay for a chance to prove one’s innocence.Police officers are supposed to be suspicious and proactive, to stop, question and arrest people who might have committed crimes, or who might be about to do so. Most officers are honest, and, I am sure, they are usually right. But “most” and “usually right” are not good enough for criminal convictions. Courts — judges, prosecutors, defense attorneys, sometime juries — are supposed to decide criminal cases. Instead, most misdemeanor courts outsource deciding guilt or innocence to the police. It’s cheaper, but you get what you pay for.
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