The number of offenders released from supervision has decreased from 104,895 in FY 2006-07 to 104,572 releases in FY 2007-08.
Over a quarter (28.1%) of the offenders were released through satisfaction of their sentence.
Over a quarter (27.9%) were released due to technical revocation.
Many offenders on supervision are tested for drugs regularly. If they test positive, their supervision is revoked and they may be sent to prison.
There are many types of electronic monitoring systems, including radio frequency, active and passive GPS. This particular unit is an active GPS tracking device, which monitors offenders in near real time.