Santae A. Tribble was convicted of killing a taxi driver in 1978. He spent 28 years in prison for a murder that he did not commit. Key evidence at his trial came from separate FBI experts who testified that their scientific analysis proved with near certainty that Tribble’s hair was at the crime scene. However, subsequent DNA testing on the hair and on other evidence excluded Tribble as the source. Mr. Tribble was exonerated in 2012 and formally declared innocent.