DNA has gone a long way to end wrongful prosecutions especially in capital cases, DNA has resulted in Many cold cases being solved from 20 even 30 yrs ago.
Recently they captured the Golden State Killer who killed and raped many in the 70s, early 80s, then stopped never to kill again. He was just captured over 40 yrs later with DNA
I am for the death penalty in very rare circumstances. Unfortunately there are some humans that are unsalvageable.