New Hampshire has been overly strict on safety inspections since before I moved here 20 years ago.
When I moved from Texas, I had to get my 4x4 SUV reinspected in order to get NH plates. I took it to a local dealership, who informed me that the vehicle failed the state inspection because the rear glass was tinted too dark. They said I need to remove the tint. The dumbass dealership didn't realize that the windows in the vehicle were factory windows with no added film or tint.
After I proved that the windows were factory-installed and not aftermarket tinted, the dealership said I still needed to replace the rear glass with untinted replacement glass. I told them to get f'd. I took the SUV down the street to a small mechanic shop that performed the inspection. Passed with no issues.
Also, NH doesn't seem to mind the hundreds of thousands of out-of-state vehicles, which are not subjected to the same level of scrutiny, that get driven into the state each year.