This is where the justice system shines. No matter the case was some 40 years old it still needed to be solved and thanks to modern science the killer didn't escape.
International Level: Activist / Political Participation: 28 2.8%
I think that DNA is going to be the fingerprints of the future. Most will match the DNA to prove beyond a doubt that you were there. Fingerprints and other physical evidence will still be used but it will be very hard to refute the presence of your DNA.