Prosecutors are focusing on DNA test results to prove a crime-scene investigator planted evidence in a 2006 double murder. DNA analyst Kaye Shepard took the stand Tuesday in the state trial of Douglas County CSI chief David Kofoed. Prosecutors say Kofoed planted blood evidence in the murders of Wayne and Sharmon Stock. Shepard says she tested a piece of filter paper that Kofoed said he used to collect evidence while searching a car linked to two men initially charged for the slayings. They were later cleared. Shepard says the DNA was so abundant she had to dilute it to test it. The test showed the blood was Wayne Stock's. Kofoed's attorney says accidental cross-contamination, not sinister motives, accounted for the match.
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