"The FBI announced that no fingerprints had been found on a guitar strap made by L.D. Cooper.[139] One week later, they added that his DNA did not match the partial DNA profile obtained from the hijacker's tie, but acknowledged, once again, that there is no certainty that the hijacker was the source of the organic material obtained from the tie."
Citation 139: Jump up ^ McNerthney, Casey (August 1, 2011). "No fingerprints found on item in D.B. Cooper case". seattlepi.com. Retrieved August 2, 2011.