The City of Dallas instituted a law that says if you don't have insurance, your car can be impounded, and you will be pulled over. Proof of insurance is required for your annual registration. So, your insurance coverage, or lack thereof is now linked to your liscense plate number, and a bored cop could theoretically park themselves somewhere and do nothing but run tags all day. Now, I am sure the argument can be made that this was a obvious grab for more $$ by the city, and I wouldn't argue.
But, I can't say that I mind it one bit.