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A comment on To find suspects, police quietly turn to Google. Parent comment

Re:To find suspects, police quietly turn to Google by ThrowawayR2 on Sunday March 18, 2018 @04:52PM (#16614256)
Bingo, knowing the location of each phone at all times is intrinsic to how the cellular network works.

The interesting question here is why law enforcement is going to Google instead of the cellular network providers directly? By definition, they're missing out on data from all non-Android phones.

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Re:To find suspects, police quietly turn to Google by lemming on Sunday March 18, 2018 @05:51PM (#16614626)
From the top comment here: The precision is greatest when GPS is on, but less precise data from cell towers and WiFi sources is used almost any time a Google app is being used on an Android or non-Android phone.

I haven't read the original article since the website doesn't work without off-domain scripts running, but I assume that's why - they do have data for iOS users running Google apps, and that data is often higher resolution than cell tower triangulation. I'd also assume they're getting the cell information as well and correlating the two.

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