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Stephan commented on Low Cost Electronic Device for Proximity tracking

Indeed cell phones can be tracked, and in the US at least this information can be use by the police for life threatening situations with a warrant from a judge. I heard about %40 own cell phones at the moment in Liberia, therefore the remaining %60 would need to be provided with cell phones or proximity devices.

I am not sure if cell phone companies have ever been asked to perform data mining to gather lists of individuals exposed to ebola patients based on location, more realistically they could provide list of calls made from and to the patient but not more (if someone knows details on this I'd like to find out). I suspect that finding intercepting paths from movements of all cell phone customers in the last 30 days is a difficult problem because it involves scanning all historical data of all customers of all competing phone companies for a given area. I'm not sure that cell phone companies store historical GPS data to begin with for older phones.

The approach I am presenting uses range detection with inexpensive radio and local storage, much cheaper and simple solution to the same problem