Nobody really knows how effective GNSS-aided tracking is in the monitoring of criminals released early from prison, but there is a burgeoning market for this type of GPS tracking, according to a recent study sponsored by the U.S. Department of Justice (DoJ). Although GNSS-aided tracking has been poo-poohed by rights activists as interfering with citizens’ civil rights, it is thought to be valuable to the whole of society to be able to track those such as high-risk sex offenders as well as parolees. In California alone, that number of parolees numbers over 100,000.

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