Which scientific development has shown that some persons sentenced to death actually did not commit the crime?

Name: Which scientific development has shown that some persons sentenced to death actually did not commit the crime?
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DNA testing has become a powerful tool in exonerating wrongly convicted individuals by proving their innocence. It has been used to overturn many death penalty cases and has brought attention to flaws in the criminal justice system.

Which Scientific Development Has Shown That Some Persons Sentenced to Death