Potential problem with DNA based Forensics

Here us an article that points out some problems with DNA based forensics: High-Tech, High-Risk Forensics. The issues include:

- DNA contamination: "In one famous case of crime scene contamination, German police searched for around 15 years for a serial killer they called the “Phantom of Heilbronn” — an unknown female linked by traces of DNA to six murders across Germany and Austria. In 2009, the police found their “suspect”: a worker at a factory that produced the cotton swabs police used in their investigations had been accidentally contaminating them with her own DNA."

- A 2005 audit of Arizona’s DNA database showed that, out of some 65,000 profiles, nearly 150 pairs matched at a level typically considered high enough to identify and prosecute suspects. Yet these profiles were clearly from different people.

As the article says "DNA forensics is an invaluable tool for law enforcement. But it is most useful when it corroborates other evidence pointing to a suspect, or when used to determine whether any two individual samples match".

I guess applying or using any Tech blindly is never good.