GPS ankle bands are gadgets that enable the criminal justice system to track offender conduct without jail.
In many circumstances, they serve as a bridge between probation and jail, allowing a convicted criminal to maintain some appearance of normalcy while limiting their activities.
There are many different kinds of GPS trackers available, each tailored to a certain sort of criminal.
Step 1: Technology for the Global Positioning System
The technology used in all GPS anklets is the same.
A GPS receiver and a communication device, generally a cellular modem, are included in each.
Every minute or so, the GPS receiver collects signals from the network of GPS satellites in orbit, delivering a precise position.
The data is subsequently sent to a central monitoring center through a cellular connection, providing the prisons department a real-time picture of the wearer’s movements.
Step 2: Exclusions from Geofencing
Geofencing technology is often used by GPS anklets to establish limited regions.
For example, the user may be able to travel anywhere he wants within a given radius of his residence using the system.
The monitoring system will continue to watch his activities inside this radius, but if he leaves it, an alarm will be sent out.
Other places, such as work or school, may be designated as permitted destinations, with the boundaries changing from day to day or hour to hour.
A monitored person, for example, may be allowed to see a family member on a specified day or travel to pick up his children from school at a specific hour.
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Step 3: Active Surveillance
GPS anklets may need active monitoring and exclusion in certain circumstances.
For example, a domestic violence offender may be prohibited from going within a specified radius of his victim, and if he approaches the victim’s home or office, sirens may ring.
A victim may also have their own GPS tracker, and if the two devices get within a certain distance of each other, alarms will ring.
Sex offenders, for example, may be prohibited from visiting schools or other venues where they could locate victims.
Step 4: Additional Protection
Additional communication or sensor devices may be included in certain GPS anklets.
For example, someone who has been convicted of a drug or alcohol-related offense may be fitted with an anklet that monitors his perspiration to see whether he is still sober.
In other situations, the GPS tracker may include a two-way communication system that allows correctional personnel to alert the user if he approaches the edge of his safe zone or enters an area that is off-limits.
Many come with a monitoring system that will sound an alert if the offender removes his anklet, preventing attempted escape.
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