California did something like this with window tint violations. It's illegal to have your windows tinted darker than some amount. In the old days, if you were ticketed for this, it would be a "Fix It" ticket. You get the tint removed, have a cop sign off that the violation was corrected, and pay some nominal fine. ($25, I think)

Almost everyone who got one of these tickets would have the tint peeled off, the ticket cleared, and be back at the tint shop the next day to get it put back on. If you like your tint, then true cost of the ticket was $225 or whatever.

Now the ticket gives you an option! You can still correct the violation, have it signed off, and pay the fee, or you can pay a larger fine and not have to demonstrate that you've cured the violation. They probably figured if the driver was going to go through the expense of removing and reapplying the tint, the state might as well see that money.

Wasn't really a loophole, per se, but it was a circumvention that the state decided to eliminate buy allowing you to buy an indulgence :)

This has approximately nothing to do with the EU. Norway is not in the EU and not in the EU Customs Union.