Here's an idea that I've been kicking around for a couple of months and don't have the time to do myself. It would effectively make radar of all types completely pointless.
The concept is to take the GPS system to the next level. Here's how.
Add bluetooth to the radar detector and have it pair with your phone. Then use SMS to send alerts when a new radar trap is found. It would then publish this information to a freely updatable service and if you're in that area it would immediately SMS message you and thus update your radar detector and notify you immediately to slow down in that area.
By doing this, the cops would get one person, and everyone else would slow down immediately. This would be really easy to impliment with SMS and a GPS chip in a detector. The only hard part is telling it if it's a false positive or not.
But think of it. It will map out all of the false positives by GPS location in all areas over time when you take it in and plug it into your computer at night, and then the only warnings you're ever going to get are those of real cops in very short order because of the communal experience.
Better yet, instead of using radar/lidar readings, use the frequencies that the cops use for their radios. Almost all of them are continually connected now and have data feeds going/coming to the cars constantly. All you have to do is detect the upstream signal and warn. Yes, it's "there's a cop car around" instead of "there is a cop car using radar" but that's actually better because then you don't get busted when they follow you and do a speed match.
Either way, combine detection with GPS and shared information using bluetooh and sms and you have one rocking system that is unstobable. It wouldn't take more than a year or two and the cops would just give up using radar/lidar entirely because it would become so uneconomical.
Oh, and put the STi tech in it too for obvious reasons