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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.
To add to this, don't use bio-metrics to lock your devices. Cops will "accidentally" use these to unlock devices when they are forcibly seized.
If you reboot your phone, the first unlock can't use biometrics
You can also set it up so biometrics can be used by apps but not to unlock the phone. That way it's easy to get to your apps and such but trivially more difficult to unlock.