If they want to piss you off or they've had a bad day, they can just make up some crap and impound your car!!
Cos my friend got his car impounded for drag racing. They took it for 6 months and he lost his licence. He protested the impounding of his car based on the fact that it is registered under his brothers name. This was his first offense too. I thought it is only 2 days for your first offense