Some British banks have taken a very Gothic approach to robbers, and Infocult approves. The question concerns the classic use of a bank employee's severed finger to get past identification technology, and coming up with a way to stop that:
London’s centuries-old gold market is to usher in an era of transparency with plans to reveal how much bullion is held in vaults in and around the city...
The vaults, in secret locations within the M25 orbital motorway, are normally equipped with extreme security measures such as blast doors and fingerprint sensors that detect the flow of blood to prevent the use of severed digits. (emphases added)
Very smart! Although one wonders exactly how this works. Are capillary scanners involved? Could they get an anemic but innocent employee in trouble?
However, we anticipate clever robbers coming up with ways to spoof blood flow. Keep your eyes open, Infocult readers.