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Looks like everyone should be getting these bags
This is a most excellent place for technology news and articles.
Better to leave your phone at home (or better, in the pocket of someone who lives in your house and takes the same daily path as you do) if you are doing something that's currently illegal. Or in any situation where you are doing something legal that the cops are likely to break up.
The juror going home thing is terrifying but I don't think the government would be after you for fulfilling your civic duty.