The vast development of forensics since 1971 could now easily intimidate D.B. Cooper out of attempting this crime again.
Technology back then was too underdeveloped to catch a calculated criminal like D.B. Cooper.
DNA wouldn’t be used forensically for until nearly 15 years after the hijacking. Had this technology been around, D.B Cooper would be rotting in jail as we speak. Investigators have attempted to obtain DNA particles from evidence, like his tie, but nothing has come of it.
The descriptions from the passengers and crew matched for the most part, but there were some inconsistencies that could have made the difference between freedom and capture for Cooper. This lack of agreement on things like his height benefited D.B. Cooper