A man who was jailed on the fantasy evidence of a single hair
"Having performed thousands of similar hair examinations over the previous 10 years, the FBI agent told the court, there had been only eight or 10 times when hairs from two different people were so similar that he could not tell them apart"<p>At worst this is a 1% error rate, at best 0.1%.  Scientific validity aside, I find it unbelievable this was not considered reasonable doubt.