Here, its illegal to sell, offer to sell, or use, so all parties can be ticketed and possibly be jailed for it (yes, you can go to jail for illegal lights), thats state law.
However as Scheinwerfermann will chime in shortly and clarify, the dealership is a "regulated party" (as is anyone who works on cars for money) and can be fined by NHTSA on a federal level, provided you can get them to actually look into it.
I ask everyone I stop where/who did the illegal mods, if the place is in my jurisdiction, im pay them a visit. Ive also been checking craigslist regularly, I see several people selling illegal lights, I plan to meet them, and ticket them.