A method for facilitating biometric security in a smartcard-reader transaction system is provided. The method includes determining if a transaction violates an established rule, such as a preset spending limit. The method also includes notifying a user to proffer a biometric sample in order to verify...http://www.google.es/patents/US8016191?utm_source=gb-gplus-sharePatente US8016191 - Smartcard transaction system and method
