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>>Tomte+(OP)
Cops may ask you not to record and even threaten you with arrest for recording. Do not be intimidated; it is your right to record without obstructing.

If you find yourself in a situation where you might be detained and thereby unable to control interactions with your device, on iPhone you can disable TouchID and FaceID by holding one of the volume buttons and the sleep/wake button simultaneously for a few seconds. This will require you to enter your passcode the next time you want to unlock iPhone. Anyone have similar instructions for Android?

>>travjo+24
You can also press the power button five times rapidly and it goes into emergency mode. It makes a loud sound and calls 911 automatically after three seconds if you don't hit cancel. It also locks out FaceID.

So if you're under eminent attack this might be a better option. It's all configurable in setting though, so test it before you go protest.