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How to secure your phone before attending a protest
(www.theverge.com)
This is a most excellent place for technology news and articles.
Cops who know they are being recorded MIGHT behave slightly better. It is why they are so hellbent on never wearing bodycams ever again.
An SD card on the person of someone being thrown in the back of a van to have an "accident" on the way to booking? Not so useful.
It really just depends what shenanigans you intend to get up to. No method is perfect, and it's good for everyone to remember that there's multiple options available.