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Do fingerprints work if a person is dead?

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Michael Vogel, been using Macs for 22 years, 12 years experience working for and with Apple · Author has 1.3k answers and 3.2m answer views. Certainly. If you look ... If you were to touch a dead person's finger to their phone's Touch ID sensor, it wouldn't do anything unless they have just recently died. read more

Also if dead body is mummified then fingerprint can be retrieved by hydrating the skin by injecting liquid paraffin, although it may reqiures high expertise to do so. So unless skin is decomposed completely then fingerprints can be retrieved. read more

once the person dies, you have about 10–12 minutes before the tissue in the finger dies, once that happens a simple scan is not going to work. Dead tissue=dry flaky cells. Same reason your sensor has trouble reading wet fingers(yep, its that accurate) make a cast. read more

The typical way of collecting fingerprints -- a special ink used to obtain prints from living people -- doesn't work so well on mummified fingers. However, using black fingerprint powder most commonly used to collect latent fingerprints at a crime scene is a fairly simple way around that problem. read more

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