[elahd]

We do, but like many things here, it varies from state to state: https://en.wikipedia.org/wiki/Vehicle_inspection_in_the_Unit....

In New York, where I live, inspections are done by private mechanics (with a state license). There's a posted inspection standard (https://dmv.ny.gov/brochure/new-york-state-vehicle-safetyemi...). Lights must be "of an approved type," but I'm not sure how you can reliably check this in a shop.

Also, some mechanics are more stringent than others. Some are outright shady. New York sets a flat $37 fee for inspections, paid to the mechanic. The fee is low, so there's an awful incentive here to look for high-margin items that "need" to be repaired to pass the inspection. Brakes and windshield wipers are some of those items. A set of aftermarket light fixtures -- if they can even be identified -- not so much. (This is anecdotal, but I've experienced this type of inspection on more than one occasion.)

Other states, like New Jersey, do inspections solely at state-owned inspection facilities.

Regarding sales, it's not illegal to manufacture off-spec fixtures. It's illegal to have them on your car on a public road.