The Multi-State Criminal History Search contains records from states representing a percentage ( which Varies ) of the population and has over 400 million records.
The Records consist of Department of Corrections, U.S. Marshalls Fugitive warrants, Administrative Office of the Courts and many other agency records.
The Multi-State Criminal Search when combined with other criminal searches like county search and social security searc, address, search and terrorist search can be a great tool to discover information that otherwise you would not have been able to fine.
This search alone, will not give you an accurate representation of your applicant.
Always use as many searches possible to be able to give you a broader picture.