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Pseudoscience in the Witness Box

The FBI faked an entire field of forensic science.

By Dahlia Lithwick
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The Washington Post reported that flawed forensic hair matches might have led to possibly hundreds of wrongful convictions for rape, murder, and other violent crimes.

The Washington Post published a story so horrifying this weekend that it would stop your breath: "The Justice Department and FBI have formally acknowledged that nearly every examiner in an elite FBI forensic unit gave flawed testimony in almost all trials in which they offered evidence against criminal defendants over more than a two-decade period before 2000."
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What went wrong? The Post continues: "Of 28 examiners with the FBI Laboratory's microscopic hair comparison unit, 26 overstated forensic matches in ways that favored prosecutors in more than 95 percent of the 268 trials reviewed so far." The shameful, horrifying errors were uncovered in a massive, three-year review by the National Association of Criminal Defense Lawyers and the Innocence Project. Following revelations published in recent years, the two groups are helping the government with the country's largest ever post-conviction review of questioned forensic evidence.
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Chillingly, as the Post continues, "the cases include those of 32 defendants sentenced to death." Of these defendants, 14 have already been executed or died in prison.
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The massive review raises questions about the veracity of not just expert hair testimony, but also the bite-mark and other forensic testimony offered as objective, scientific evidence to jurors who, not unreasonably, believed that scientists in white coats knew what they were talking about. As Peter Neufeld, co-founder of the Innocence Project, put it, "The FBI's three-decade use of microscopic hair analysis to incriminate defendants was a complete disaster."
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This study was launched after the Post reported that flawed forensic hair matches might have led to possibly hundreds of wrongful convictions for rape, murder, and other violent crimes, dating back at least to the 1970s. In 90 percent of the cases reviewed so far, forensic examiners evidently made statements beyond the bounds of proper science. There were no scientifically accepted standards for forensic testing, yet FBI experts routinely and almost unvaryingly testified, according to the Post, "to the near-certainty of 'matches' of crime-scene hairs to defendants, backing their claims by citing incomplete or misleading statistics drawn from their case work."
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