That still blows my mind that some states actually require you to bring your vehicle in to be "inspected." That's just so..... foreign to me.
I'm firmly of the belief that this should be mandatory nation-wide. The safety thing is much more important that the emissions, IMO. There are tens of thousands of people driving total f*cking deathtraps on American roads right now.
What is totally batshit stupid is how much this varies from state to state. North Carolina has some rather tight stuff. A "spot of rust" isn't going to condemn anything but if the seat is falling through the floor, how well will the car fair in a crash? Not very well, I'd imagine. You have to pass a "tampering" inspection which basically says you can't have aftermarket ECUs, cat-less exhausts, etc. Then there is the emissions part. If your car is OBDII they just plug a computer into the DLC. If its pre-OBDII then there is a tail pipe test. If the car is more than 20 years old, but pre-OBDII then you don't have to pass the tailpipe test. This test is a whopping $35. If you can't afford $35 you really can't afford a car...especially in NC where you have to pay tax on cars you own. Not just when you buy it, but every year like a house or something. Crazy. They also make you get a license for your cat, and keep its shot up to date even if it never leaves the house.
Now California is completely f*cked. The state puts catalysts on lawnmowers, but doesn't care if you Civic still has the bumpers and seatbelts. Zero safety at all. Furthermore there is the bullshit where every other year you have to take your car to be inspected not by a real mechanic that actually knows WTF he is doing, but to one of these shitball "inspection only" places that don't do any work. The theory, I guess, is that this protects the driver from getting sold repairs he doesn't need and stuff, but in reality its just a big pain in the ass because if you fail the inspection you still have to find a real mechanic to do the work anyway. Furthermore, why are they even doing tailpipe tests on 5 year old cars? The OBDII cars either pass or fail their own internal emissions checks anyway. If the MIL isn't on, and all the monitors are ready, there is no way its going to fail the test. If the MIL is on, then its an automatic fail. Easy.
I'm told Colorado uses an abbreviated IM240 with an actual rolling road. I'm not sure about this though.
States rights is a bunch of shit...