It is also a fact that regardless of the new law most of them will also tag your car with a tracking device. If you are able to nail them for that sue them.

“The ACLU recently obtained records from over 200 police departments and other law enforcement agencies around the U.S. They found that "virtually all" of these agencies track the location of cell phones with data supplied by wireless carriers. (For information on police in your state, check the ACLU's interactive map, which shows details from responding agencies. Not all states or agencies responded to ACLU's public-records requests.)”

http://www.cnn.com/2012/04/03/tech/mobile/police-phone-tracking-gahran/index.html