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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.
This is good to know, but adds an additional step to simply requiring a passcode to unlock on screen lock.
It's also much more secure to reboot (and not unlock) it, should it be taken from you and potentially tried to be broken into or compromised in some way, usually to extract data and perform forensics. A phone that has been unlocked is weaker with protection than one which has been restarted and awaiting first unlock.