On a September night in 2004, in the woods on the outskirts of Boston, a 19-year-old girl later known as J.G. in court documents tucked a rumpled condom into her bra. She had been the victim of sexual assault only minutes before, and one of her two assailants had used the condom during the attack. J.G. knew enough about crime scene investigation to understand that if she got the condom to the police, it might help identify her assailant. She was at least half right.
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