20 baffling forensic cases that stumped everyone
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John Schneeberger’s bad blood
For years, a female patient claimed that John Schneeberger, a physician in Saskatchewan, Canada, had drugged and raped her in 1992. But repeated DNA tests failed to match the sperm sample from her underwear. The patient hired a private eye to obtain DNA samples from Schneeberger’s car – which proved to be a match. Investigators brought Schneeberger back in for more extensive tests and were finally able to get a match and reach a conviction (he was also convicted of drugging and raping his step-daughter). At trial, Schneeberger revealed how he had been able to fool the DNA exam: He had implanted a vial of another man’s blood in his bicep and tricked the nurse into drawing blood from that vial.