I watched a pickup roll coal in the middle of freaking East Bay, literally within site of downtown San Francisco, on a bicyclist. I reported their license to the California Air Resources Board, and not longer after that I saw it up on jacks in a neighborhood auto shop. That made my day. Asshole.

California is rather strict on emissions. Other states don't care. I used to work for my state's version of the DMV and the only public facing page where one could report things was to report people who would not register their cars locally (many people who purchase very expensive cars chose to register them in Montana). There used to be a web page to report license plates that were worn and needed replacing (like the reflective coating wore off, or all the paint got scratched off).

I'm in Idaho, so not such resource exists. It would have to be a federal agency that does the enforcement because our cops/prosecutors/lawmakers won't ever make something like that happen.

I'm in Texas, and I get coal rolled multiple times a year while I'm riding my bike. One asshat actually hit my shoulder with his extended mirror. After that, I started using my GoPro as a dashcam since I wasn't able to get the asshat's license plate number.

I had a neighbor with a car they clearly wouldn't fix that desperately needed a smog check. reported them also. they moved away shortly after though, so i'm not sure if CARB ever followed through.

Here in Colorado we have a new anti coal rolling law, with a hotline you can call it in on.

You know what happens when you call it in? The government sends a letter to the registered address of the truck saying, basically "Hey! Your emissions are very wasteful, you should get that checked out!". Glad California seems to have some teeth to the emissions laws.