A single hair has put George Perrot behind bars for nearly 30 years.
Perrot, then 17, was tried and convicted of rape and burglary based on a piece of hair found on the bed sheet of a 78-year-old woman who had been raped, The Guardian reports.
There was no blood or semen. Just the hair.
An FBI agent named Wayne Oakes testified that he knew with certainty that the hair belonged to Perrot.
Trouble is, Oakes was wrong, and Perrot is still hoping for a retrial.
Oakes is among an elite FBI unit that gave faulty testimony in hair evidence cases for two decades, a discovery recently made public. The news is expected to spur retrials for many people.