Editing D. B. Cooper (section)

===Cigarette butts===

In the armrest ashtray of seat 18-E, FBI agents found eight Raleigh filter-tipped cigarette butts. The butts were sent to the FBI Crime Laboratory,{{r|vault_65|quote= "The Laboratory is also requested to examine the ashtray contents and specifically process any Raleigh filter tip cigarette butts for possible fingerprint identification or comparison."|page= 43}} but investigators were unable to find fingerprints and returned the butts to the Las Vegas field office.{{r|vault_66|quote= "No latent prints of value developed contents of ashtray."|page= 228}} In 1998, the FBI sought to extract DNA from the cigarette butts, but discovered the butts had been destroyed while in the custody of the Las Vegas field office.<ref>{{cite report|date= December 9, 1971|title= FBI Evidence Review|quote= "The DNA Unit was contacted and agreed to perform an unknown subject analysis on the numerous cigarette butts left by COOPER on the aircraft that day. They believed it likely that DNA could be recovered. Unfortunately, it was discovered that this evidence had been destroyed years earlier in Las Vegas."|url= https://vault.fbi.gov/D-B-Cooper%20/d.b.-cooper-part-51/view|publisher= Federal Bureau of Investigation|page= 196|access-date= November 7, 2022|archive-date= November 7, 2022|archive-url= https://web.archive.org/web/20221107182540/https://vault.fbi.gov/D-B-Cooper%20/d.b.-cooper-part-51/view|url-status= live}}</ref>