Q. State Laws on Periodic Vehicle Inspections
You can find a list of states in the US which conduct vehicle inspections on the Environmental Protection Agency (EPA) web site:
See also the American Association of Motor Vehicle Administrators' Vehicle Inspections web site: http://www.aamva.org/KnowledgeCenter/Vehicle/Inspections/SafetyInspections.htm
(Note: The above private-sector site is not maintained by US DOT or any other US Government office. We take no responsibility for the content or accuracy of any non-US DOT web page, and offer the above link strictly as a courtesy, should you be interested.)
For more information, please contact your state Department of Motor Vehicles (DMV) directly. Attached is a listing of DMV contacts for the US, sorted by state.