Hair samples are one popular way to obtain DNA evidence.
But the FBI plans to examine more than 2,000 cases in which hair samples led to a conviction, McClatchy Newspapers reports.
The FBI plans to examine more than 2,000 cases from 1985 to 2000. Some of those cases include people awaiting execution and others who already died in prison.
The idea is to determine whether conclusions were hastily reached about a case based on hair samples, McClatchy Newspapers wrote.
“This will be critical to giving wrongfully convicted people a fair chance at a fair review,” said Steven D. Benjamin, president of the National Association of Criminal Defense Lawyers.