I'd advise to be careful, as they check the tint level of front driver/passenger windows as part of your yearly vehicle inspection in TX.  I bought a used car from a MB dealer and got flagged at a 3rd party inspection business.  Complained to the dealer's service department about selling me a car that failed inspection.  They offered to inspect (and pass) my inspection.  Perhaps your tint place can also do inspections.  
 
This thread should probably be in the Sandbox.