 SafetyPIN is not currently used in ATM systems, despite widely circulated rumors originating from a chain letter e-mail, mainly due to issues regarding reversible PINs being incompatible with the system and potential security vulnerabilities that could arise if implemented.The concept of a backup emergency PIN system, or duress code, for ATM systems has been around since at least July 30, 1986, when Representative Mario Biaggi, a former police officer, proposed it in the U.S. Congressional Record, pp.18232 et seq.