Should juries believe forensic evidence?
On “CSI,” forensic evidence is key to solving almost every case. In real life, many forensic techniques are of questionable scientific validity. Human error and even intentional bias infect these tests. Analysts sometimes work to prove prosecution cases rather than presenting neutral findings. Far too often, analysts exaggerate the statistical certainty of their findings. In 2009, the National Academy of Sciences issued a report questioning the scientific validity of many common forensic science techniques. In 2015, the FBI admitted that, for decades, its analysts had been making serious errors in at least 90 percent of cases involving testimony about microscopic hair comparison...
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