There was once a time when , upon the discovery of a chewed - on corpse in a unattackable underground military bunker , it was out of the question to determine whether responders were deal with a regular psychopath or a full - scale snake god invasion . Those dark times have ended . scientist can now say the difference between a fingerprint made by a living body or dead flesh .
This is n’t just an technique meant to screen out zombie killers . It also rules out Demolition Man style certificate severance in which people use dead finger’s breadth to outwit fingermark scanners . More seriously , it can end the material payoff for hack mass ’s fingerbreadth off to get memory access to secure field , or even high - value cars . There have been some macabre report of multitude consume their limbs amputated to beat such scanners .
There are many differences between living and dead hands . ( For instance , it ’s creepy to hold living hands some of the sentence and dead hands all of the time . ) Most of those conflict are difficult for a car to quickly and faithfully measure . The most reliable difference , though , is the fact that living hide pales when it is push against a control surface . The capillary tubing that race blood around the surface of the body are n’t able-bodied keep themselves open under pressure , and blood leave behind that part of the skin . Although different fingertip may be different shade , the color change is changeless .
go fingers with all their blood in them absorb visible radiation of about 550 nm . When the skin is pressed into paleness , the colour modification to absorb light at about 1450 nanometer . If there ’s no modification , the blood has already left the soundbox . If the detector does n’t sense a change between first contact and an extreme press of the hired hand , it can suspect that either the stagnant walk among us , or someone is missing something important .
ViaNew Scientist .
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