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Don’t ever hand your phone to the cops
(www.theverge.com)
This is a most excellent place for technology news and articles.
For Android:
Now when you hold your power button, you get a "lockdown" option that disables biometrics and forces you to enter your passcode for the next unlock.
Particularly useful for me, as I have my phone set up to always be unlocked if my watch is close enough (maybe stupid of me), but I can force lock it at any time.
On some phones you won't get anything when searching for "lockdown" but you most likely have it, it's typically under Display > Lock screen > Shown lockdown option.
I appreciate you.
Also relevant:
Yo! Where was this when my nephew was small and wanted to play Angry Birds on my phone lol