"... smartphones now contain more evidence than ever before — and it’s become easier for suspects to wipe the phone from afar in the time it takes to get a warrant.
The legal question is going to the [U.S.] Supreme Court. But, in the meantime, a law professor is proposing a simple, low-tech solution: when making an arrest, cops should stick the cellphones in a Faraday Bag or simply wrap the phone in aluminum foil. Doing so would give the police time to ask for a warrant to search the phone, and also prevent the suspect from wiping its contents in the meantime."
https://gigaom.com/2013/08/28/how-t...ell-phone-searches-while-preserving-evidence/
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Edited to add -- I don't know whether this is what TPS does; I guess that I read that posting from an American source in 2013 and drew the conclusion that it must happen here. Maybe someone who knows firsthand can chime in.
Edited to add, v. 2 -- I suppose this lends a hilarious new meaning to the olde expression "curses, foiled again".