As a humorous aside, I got a ticket tossed and my towing fee refunded my last time. The cop checked the incorrect violation on the ticket (not surprising because it was about -10F that night), and I successfully argued that (for that reason) the towing company had no authority to tow.
The look on the traffic judge's face was priceless when the city attorney said "We are not challenging that argument." She responded,
"I think I'll just dismiss this one and let you get on with your work."