All but a few of the accused have been exonerated or had their verdicts overturned in post-conviction legal proceedings.

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Damon Thibodeaux was released in September after 15 years on Louisiana's death row, after post-conviction doubts were raised about whether he killed his 14-year-old step-cousin.

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Meshbesher says he won a post-conviction proceeding in a felony case last year, but he has never seen anyone do it in a misdemeanor case.

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The difficulties encountered in attempting to re-examine and challenge clearly erroneous verdicts have been compounded in recent decades by limitations in the ease with which post-conviction legal review is available.

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Lengthy delays between conviction and execution are often the result of protracted post-trial appeals and motions, said legal experts.

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