Thats pretty cool they're wanting to utilize drones I'm almost certain it could help detect drug crops since such a small device wouldn't draw as much attention as a full size helicopter. The only issues I think there would be are the limited range/battery although 30 minutes is not bad at all, the assumed lack of IR (to detect individuals in hiding in foliage) and the odd situation when you would need to chase someone. I mean with the full sized helicopter you just zoom out a little or go up a few more feet and you have a better view where with the drone you might have a little more trouble doing so. Also what if something happens to the drone say a bird flies into it and the thing comes down on a bystander or damage property? I know probably really really rare but when is the last time you've heard of a police heli' falling out of the sky and hitting someone/something?