DEAD MAN'S SWITCH?
I've always wondered about using fingerprint access on devices, thinking it's a lot more secure to have a secret password that can't be hacked by just getting you drunk. You pass out and your fingers unwittingly betray you. Or an even less scrupulous person might hack your phone by simply hacking your finger off.
I'm reminded of Lister using a severed hand to open that door on Red Dwarf, secured by palm print (disgusting…maybe, effective…certainly).
As I've said before, the mass digitizing of faces and fingerprints "for security reasons," will really speed things up when the jackboots start segregating the homeland.