A Social Security Number cannot be flagged on a background check, but mismatching information returned from SSN search may be flagged. A SSN verification and/or trace searches the Social Security Administration data base by SSN. The information that is returned is name, date of issuance, validity of number, address history, and state of issuance. If the information that is returned does not match the information provided by the applicant, the results may be flagged. An employer or landlord may choose the specific circumstance that the information would need to be flagged.