ABAJ: GPS ankle monitors can call and record people without consent; do they violate 5th Amendment? by Debra Cassens Weiss:
GPS electronic monitoring devices made by a company called the Track Group can call and record people who are required to wear the ankle monitors because they are on probation or awaiting trial.
The device, known as the ReliAlert XC3, is supposed to play a three-note sound when an official calls and a recording begins. But a technician testified in a 2014 case in Puerto Rico that the listening and speaking capabilities can be turned on without warning, according to a joint report by the Appeal and CityLab.