News Discarded DNA: The controversial clue in the trash that’s bringing serial killers to justice July 21, 2023July 21, 2023 Kayla Jimenez, USA TODAY Comments Off on Discarded DNA: The controversial clue in the trash that’s bringing serial killers to justice The case illuminates a tactic called "surreptitious DNA collection" that is showing to be more of a common technique used in cold cases.