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Electronic tagging is a form of non-surreptitious surveillance consisting of an electronic device attached to a person or vehicle allowing their whereabouts to be monitored. In general, devices locate themselves using GPS and report their position back to a control centre, e.g. via the Cellular phone network.
A simpler form is in regular use in the United Kingdom, where a base station is connected to a telephone line at the offender's home, and a tag is attached to the offender's ankle. If the tag isn't functioning and within range of the base during curfew hours, or if the base is disconnected from the phone line, then the authorities are automatically alerted. Instead of allowing full location tracking, this system can be used to enforce curfews, which commonly form part of community-based sentences, and the conditions of parole of offenders recently released.
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