Ray Krone was convicted of murder in Phoenix, Ariz., and sentenced to death. The key evidence used to convict him was the testimony of a certified forensic dentist who concluded that a bite mark on the deceased came from Krone. Ten years later (fortunately before he was executed), D.N.A. testing proved the dentist was wrong, cleared Krone and identified the real perpetrator, who was in prison for a subsequent sexual assault.
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