Tracking could be efficiently done in a system such as a mall or subway with exit monitoring.
That's already the case in Brussels public transport. We have to use RFID cards to check in before stepping in a bus, tramway or metro, and the STIB/MIVB (the Brussels public transport service) said they could handle the date to the police if they wanted to know where some people was at a certain time.
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Tracking could be efficiently done in a system such as a mall or subway with exit monitoring.
That's already the case in Brussels public transport. We have to use RFID cards to check in before stepping in a bus, tramway or metro, and the STIB/MIVB (the Brussels public transport service) said they could handle the date to the police if they wanted to know where some people was at a certain time.