Forensic evidence has long been used in the US legal system The use of DNA evidence has dramatically changed much about forensic science.
1. Changed the legal standards for use of forensics in the courtroom
2. Changed the way that biological evidence is collected (and preserved).
3. Changed how police are trained to investigate crimes.
DNA is considered to be superior in many ways to other forms of forensic evidence.
Classic fingerprints, hair analysis and serology tests (blood, semen, other bodily fluids) all questioned recently.