[briHass]

These are only useful for otherwise-law-abiding people who go a little too fast. The trend in big cities in the US is to joyride/race with your license plates removed, obscured, or fake, and that's assuming the car isn't stolen (Kia/Hyundai.)

[dghlsakjg]

I think there would be constitutional challenges in the US, but in Canada, the police are allowed/required to seize your vehicle roadside for certain offenses (unfair if you are found not to have committed and offense, but I've never heard of that happening).