http://http://www.insor.org/insasoweb/ Much of the information derives from official records but some is gathered from the offenders themselves who are required to list their address when they have been released into the community at large, whenever they move, and as part of an annual verification process. It is your responsibility to make sure the records you access through this site pertain to the person about whom you are seeking information by working with law enforcement or other criminal justice authorities as appropriate.
http://http://www.insor.org/insasoweb/