http://guysoflidar.com/faq.html#3

The following states are known to have legislation prohibiting the use of laser jammers:

California
Colorado
Illinois (as of 1/1/2006)
Minnesota
Nebraska
Oklahoma
Utah
Virginia
Washington DC

fortunately most LEOs don't know a Laser Jammer exists and furthermore those who know they exist most don't believe they actually work :)

if you are that worried you can get a stealth kit from israel (or DIY it) that allows you to hide the transponders with remote up and down for hiding