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Google Will Stop Telling Law Enforcement Which Users Were Near a Crime
(finance.yahoo.com)
This is a most excellent place for technology news and articles.
Cops only investigate people they think are guilty, and despite being objectively terrible at their jobs, they have ridiculous amounts of self confidence.
So to them, if they suspect someone of a crime, they can "bend" any rules for stuff like this because "the suspect is clearly guilty anyways, we just don't have proof".