Bruce Schneier mentions .... And questions constitutionality ... Useful at the link.
Identifying People Using Cell Phone Location Data
The two people who shut down four Washington power stations in December were arrested. This is the interesting part:
... Investigators identified Greenwood and Crahan almost immediately after the attacks took place by using cell phone data that allegedly showed both men in the vicinity of all four substations, according to court documents. ...
More and interesting related comment at the link ...
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