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Does anyone know if and how this would affect cellphone companies who sell location data to data brokers?

http://www.latimes.com/business/la-fi-verizon-location-data-...

You practically can't opt of this or are often unaware given the complexity of an average app's TOS.

The decision seems to be pretty narrowly focused on law enforcement and rules of evidence, so it shouldn't stop practice from continuing.

How would this affect law enforcements ability to use data they bought from telcos?

IANAL, but the way I read it they would not be able to use that data without a warrant, which will likely mean that law enforcement will no longer be paying for a third party when they could just use the warrant to get it directly from the telcos. (Unless the telcos don't have historical data but a third party does? Either way, a warrant would be required to gather that data without risking jeopardizing the entire case.)

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