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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.
There's zero benefit for Google to hand over this information, and potentially face a lawsuit because it actually turns out that no it wasn't legal for this information to be handed over. Google are of course aware that cops don't necessarily obey the law, so just because you've been asked to by a cop to provide something doesn't necessarily mean it's legal for you to hand it over.
It's much simpler if they just don't have this data. That way they can't hand it over, so there's no problem.
In this case an issue avoided is very much an issue solved.