after the CAA raised concerns about the legality of using them without a license ?
The micro drones can be used without liscence if they are not flown near houses or not higher than around 200 ft ect ect.
GPS jamming will indeed put the commercially available micro drones into auto land mode, but the larger more expensive UAVs could be manually flown back to base.
I'd suggest that a manned police helicopter be a good defense against unwanted micro drones with sinister 2kg payloads. We need manned helicopters over London (along with other measures) in 2012 to help counter this serious new threat.
Microdrones; a poor government's ASU and a poor terrorists' cruise missile.
Mickjoebill