Guy walks into the local chevron a robs it with a threatening hand in his hoodie. Probably not too smart. Probably had a cell phone in his pocket pinging the local tower every few seconds. Some detective work might identify him with a cell phone dump by police but not worth the effort to them. A
murder involved then maybe and attribute the source to an informant (parallel construction).
Much better: A femtocell in the store recording the imsi of every cell phone in the short range vicinity with a time stamp. Entry is de facto permission to record the Imsi info like a security camera. Big opportunity for cell phone providers or independents to get into the business.
Maybe Is already being done? Simple, cheap.
Surveillance society should have some degree of return for invasion of privacy that we can't do anything about anyhow.
Cell pot is a concept that could do this?
http://www.technologyreview.com/view/535201/the-face-detection-algorithm-set-to-revolutionize-image-search/
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