The endless use of a Biometric Scanner, not just for passport and visa purposes but all other aspects needed to live, survive and thrive.
There are a lot of biometric devices these days but the most popular among all these is the thumbprint scanner. It works on the principle behind the biometric system wherein it uses sensors to capture images. In this case, a unique pattern of capillaries just underneath the skin. This can only be seen when blood is running through them. So if a criminal cuts off your finger and uses it on a the scanner, the device will not be able to recognize as the patterns disappear as soon as the blood is cut off. Therefore, the finger or the thumbprint can no longer be used for identification.