"This report is based upon the results from a survey conducted of the administrators of the State criminal history record repositories in July-- December 2007. Fifty-five jurisdictions were surveyed, including the 50 States, the District of Columbia, American Samoa, the Territory of Guam, the Commonwealth of Puerto Rico, and the U.S. Virgin Islands. Responses were received from all 55 jurisdictions. It presents a snapshot as of December 31, 2006."
National Criminal Justice Reference Service: http://www.ncjrs.gov/