It would be nice if dealers could be delivered a formal registered letter (maybe from the crown?) that explains what you can and can't put over a plate. After that letter is delivered, if they are found to contravene the law, the corporation catches a fine (say $10,000 for a first offence, increasing exponentially for further offences). It would be a lot faster to clean up 99% of the problem by targeting a few thousand dealers than a few million drivers. Easy to enforce, a cop just waits for somebody to drive out with their brand new car, takes a few pictures and walks back to the dealer and tells them to bend over.
Didn't the dealer's mechanic just release an illegal car? Why isn't his license on the line.