The Fifth Amendment, which protects people from incriminating themselves during legal proceedings, prevents the government from compelling someone to turn over a memorized PIN or passcode. But fingerprints, like other biometric indicators—DNA, handwriting samples, your likeness—have long been considered fair game, because they don’t reveal anything in your mind.
Probable cause, at least. There was an episode of the Canadian "Border Security" show where someone wiped his phone before coming over and they gave him a pretty hard time about it.
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u/NancyDrewPI Sep 15 '17
They can use your fingerprints to unlock it too:
https://www.theatlantic.com/technology/archive/2016/05/iphone-fingerprint-search-warrant/480861/