1. Most law enforcement agencies still use radar so you might use it but more often won't. 2. It transmits signals which is against FCC regulations. You've probably seen the warnings (1. This device may not cause harmful interference and 2. This device must accect any interference it receives including interference that may cause undesired operation) I think it might be a federal offense since you're messing with the U.S. Federal Communication Commisions' regulations.
John Yim (Houston) 91 ZTT Stage III+ 30 BSP, Houston Region SCCA "...Just as they're about to catch me... Twin... Turbos... Kick... In..."