Olfactory biometrics to be used in fraud prevention

So much for that signature on your credit card. Soon you won’t need to sign it at all, because it will smell like you. American Express has filed a patent on olfactory biometrics technology that will add a customer’s “smellprint” to their credit card. Store clerks using e-nose technology would sniff the card, then the customer, looking for a match.  Read more at Best Mode.