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The original was posted on /r/todayilearned by /u/Kale_Brecht on 2024-06-14 14:16:12+00:00.

Original Title: TIL in 1998, the FBI sought to extract DNA from the cigarette butts smoked in 1971 by the unidentified airline hijacker known only as D.B. Cooper, but discovered the butts had been destroyed while in the custody of the Las Vegas field office.