http://www.foxnews.com/story/0,2933,196455,00.html
Hannah Sentenac
The crimes of convicted sex offenders are starting to haunt them … literally. Many states are initiating programs that track registered sex offenders using Global Positioning Satellites, or GPS, sometimes for life. GPS can track the exact location of the offenders at all times, making it easier for law enforcement to ensure that they're abiding with the terms of their release.