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“RFID technology is increasingly used to ensure that people remain under house arrest or as an extra security measure to ensure that prisoners do not escape. For example, a company called Alanco Technologies produces a system called PRISM. With it inmates wear RFID transmitters in a tamper-proof wristband which broadcasts a signal every two seconds to readers throughout the building. Everybody is identified and tracked by a unique signal which is managed by a central computer database. Now, in general the people do not give a hang about the freedoms of convicted felons but there are proposals to extend similar RFID systems to tourists or migrant workers visiting the United States to ensure that they do not over stay their visas.”