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dprovine writes "According to a joint investigation by The Washington Post and 60 Minutes, a forensic test used by the FBI for decades is known to be invalid. The National Academy of Science issued a report in 2004 that FBI investigators had given "problematic" testimony to juries. The FBI later stopped using "bullet lead analysis", but sent a letter to law enforcement officials saying that they still fully supported the science behind it. Hundreds of criminal defendants — some already convicted in part on the testimony of FBI experts — were not informed about the problems with the evidence used against them in court."
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