ADDS GENERIC - El Dorado County District Attorney Vern Pierson displays a generic genetic DNA ribbon as he discusses how new DNA evidence was used to help exonerate a man who spent about 15 years in prison after being wrongly convicted of killing his housemate, during a news conference in Placerville, Calif., Thursday, Feb. 13, 2020. Ricky Davis was convicted in 2004 of second degree murder in the stabbing death of a newspaper columnist. But the conviction was thrown out after new evidence was found implicating another person. (AP Photo/Rich Pedroncelli)
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