Why don’t cop cars contain advertising? For that matter, why not all public vehicles? I mean, buses do. But these vehicles are everywhere, and could be a good source of extra revenue for a city. Imagine putting one of those “900-ASK-BILLY” lawyer referral numbers on a cop car or fire truck. Or better yet, an ad for ShamWow or Zorbeez on the side of an ambulance. “Absorbs up to 200 times its own weight in street blood!”. There’s a fortune in advertising money waiting to be made here.