Per radarbusters.com, "Laser Jammers and Radar Jammers are illegal in the states of Nebraska, Minnesota, Utah, California, Oklahoma, Virginia, Colorado, Illinois and Washington DC." That video illustrated one issue with a jammer, that it's suspicious to the cop when he gets no reading when he normally would. Radarbusters.com talks about jammers that generate error codes. I don't know how viable that is. One nice thing about Passports, is they're designed to be integrated with laser "shifters" made by Escort. The alert goes off on the radar detector, you slow down, then shut off the shifter so the cop can get a "good" reading. I've been wanting to do this for a while, but it's not cheap:
http://www.passportsr1.com/