http://www.ktla.com/news/landing/la-na-drone-arrest-20111211,0,5744305,full.story
From a civil rights perspective, I'm strongly against the use of these things for spying on U.S. citizens. Furthermore, if their use continues to increase, I can imagine plenty of new restricted airspaces to give them unfettered use of the skies. Oh, well, on the bright side, they're only about 15 - 20 times the cost of a new helicopter, so after they find about 25000 more cows, it will start paying for itself.