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The Making of a DNA Detective

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Christy Mirack was murdered in 1992, but the case wasn’t solved until last year. The 25-year-old sixth-grade teacher was found dead in her home near Lancaster, Pa., naked from the waist down. She had been beaten, strangled and sexually assaulted. Police collected a semen sample, ran it through a DNA database, and found no matches. The crime went into a cold-case file. In June police arrested a 49-year-old suspect, Raymond Rowe, a local disc jockey known as “DJ Freez.” They found him with the help of Parabon NanoLabs, a Reston,...

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