- Sep 25, 2001
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Tech tool offers police ‘mass surveillance on a budget’ - WTOP News
Local law enforcement agencies have been using an obscure cellphone tracking tool, at times without search warrants, that gives them the power to follow people’s movements months back in time, according to public records and internal emails obtained by The Associated Press.

- anonymous data to create location analyses known among law enforcement as “patterns of life."
- do not contain the name of the phone’s user, but can be traced to homes and workplaces to help police establish pattern-of-life analyses.
No warrant because anonymous data but:
geee.. just track the phone back to the person's home and you now have a name.
How it's used:
Missing person's phone is found and no other clues.
Police use the tracking tool to see what other phones were around the missing person's phone at that time. (ie: within x feet)
i assume Trace all the phone signals found back to houses, get names, and start doing detective work
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