Criminalist implicated in cold-case murder never told detectives about possible contamination source

Kevin Brown committed suicide while under investigation; his widow is now suing police

John Wilkens
February 12, 2020
San Diego Union Tribune

A San Diego police detective testified Wednesday that when retired criminalist Kevin Brown was told his sperm had been linked by DNA tests to a 30-year-old murder case, he offered two possible explanations: Either the evidence was planted, or he’d had sex with the victim. What he didn’t say, according to the testimony by detective Lori Adams, is that he and other criminalists routinely kept their own semen in the lab, a possible source of contamination that could explain the DNA results.

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