Can DNA evidence solve a 30-year-old crime?

The rapping of knuckles on wood brought Kevin Brown to his front door on the morning of January 9, 2014. The uniformed detectives standing on his doorstep introduced themselves as Michael Lambert and Lori Adams of the San Diego Police Department. Lambert looked familiar to Brown, who had worked for the department as a crime-lab analyst from 1982 until his retirement, in 2002. The detectives said they wanted to discuss an old case with Brown, and he invited them in.

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