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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.
Better: restart the phone. This puts it into the safest state it has, as it has not yet been initially unlocked and will require a non-bio auth. Stronger security, may/should hold if they attempt to attack/hack/compromise it, if it comes to that. Takes like 3 seconds. Do it, not the equal-time-worse-security version of just disabling bio.