Although operating at a different wavelength, the technology for laser detectors (and jammers) has been on sale for years - for ground-based laser speed guns. Rather than passive systems though, the obvious action is an outright ban on their sale or possession with hefty criminal penalties for breaches.
If anyone doubts the power of a green laser, you can see one light up a match at this link:
http://www.spymode.com/laserv/match.avi
Even at a great distance, they can inflict permanent eye damage.