HOW UNDERCOVER COPS get suspects’ DNA. “And this is one of the main reasons that biometric identifiers are so very risky… You can protect the PIN for your debit card by shielding the keypad when you enter it, but how do you keep counterfeiters from getting your DNA for authenticating the debit-card of the future? We throw off fingerprints, DNA, hand-geometry impressions, gaits and other biometrics at a titanic rate, and there’s no way to stop, short of spending all your time in a hazmat suit.”