Verify their distributors are doing some sort of due diligence? Doesn’t seem that hard to make some sort of reasonable effort.

Is the rule really about "track use" or is it just off-road or on-private-property use? How does the distributor know I'm not just rolling coal on my uncle's farm?

From what I can find, "track use" isn't in the law, but rather a matter of enforcement discretion.

"The Clean Air Act does not contemplate removing emissions controls from an EPA-certified motor vehicle in order to convert it into a competition vehicle. As a matter of enforcement discretion, the EPA’s longstanding practice has been not to take enforcement action against vehicle owners for removing or defeating the emission controls of their EPA-certified motor vehicles, so long as they can show the vehicles are used solely for competition events and no longer driven on public roads."

https://www.autoweek.com/news/industry-news/a36482793/sema-e...

They will require you to fill out a waiver saying you that you will use it for offroad use only, and all liability is on you and not them. They will also require you to upload your photo id in order to purchase it.

Man I wish they would do that here for all the "offroad use only" aftermarket LED bulbs that idiots stuff into non projector lenses.