For two years, German police have been hunting an elusive female serial killer nicknamed The Phantom. Now they have discovered that the DNA may be from a worker at the factory where their swabs were made, and that the serial killer never existed.

http://www.time.com/time/world/article/0,8599,1888126,00.html

Like the British police, they seem to have put all of their focus on DNA instead of on other more reliable evidence. Until they get over the "DNA is infallable" idea, many more mistakes will be made. Some guy blows his nose in a tissue and then tosses that tissue into a bin. I can retrieve that tissue, commit a crime and use his DNA from the tissue to lead the police in the wrong direction. DNA should be used only as back up for other real evidence. That's my opinion.