For the latest exhibit of the fallibility of the judicial...

For the latest exhibit of the fallibility of the judicial system, we turn to Joyce Gilchrist, a chemist with the Oklahoma City Police Department who has worked on more than 3,000 cases. Oklahoma has executed 11 persons based at least in part on her work. Twelve more remain on death row. Yet in recent weeks the FBI labs have been sharply critical of her performance in a sample of cases, accusing her of offering testimony "beyond the acceptable limits of forensic science" in several. A comprehensive review of Ms. Gilchrist's work is now underway.