REMEMBER THIS WHEN THEY TELL YOU THE SCIENCE IS INFALLIBLE: DNA Blunder Creates Phantom Serial Killer. “The only clues that ‘The Woman Without a Face’ left behind at 40 different crime scenes were DNA traces. These were collected on cotton swabs, supplied to the police in a number of European countries. Now police investigators have established that in all probability the DNA had not been left by their quarry but by a woman working for the German medical company supplying the swabs, who had inadvertently contaminated them.”

That’s right: Her DNA was on the cotton swabs they used to check for DNA, because she worked at the cotton swab factory.