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Suspects can refuse to provide phone passcodes to police, court rules
(arstechnica.com)
This is a most excellent place for technology news and articles.
I think all Android phones have this feature, but it has to be turned on.
You can also turn your phone off if they ask for it. Phones need the password to unlock if they've been turned off.
But I like lockdown more, since it can still record audio.
Wow thanks had no idea this was an option on my Samsung. . it was just hiding disabled in my settings as "lockdown mode"