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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.
A lot countries have this now.
Even for a number of countries where it's not technically enshrined in law, police can still effectively do it anyway, by detaining you for as long as they like until you comply.
The solution is to simply shit yourself, without breaking eye contact, while under their custody to assert dominance.