You can't make this shit up. > Police in North Dakota borrowed a $154 million MQ-9 Predator B drone from the Department of Homeland Security to arrest a family of anti-government separatists who refused to return six cows that wandered onto their farm.
There is a base in Grand Forks, ND that houses several CBP (Customs and Border Patrol) Predator Drones, and they work with local law enforcement when asked to.
So, more than likely, the drone is going to be flying home here anyway, and made a pass over some property.
The facility where these things are flown from isn't some top secret bunker or anything, it's an office building on the air force base, and they give tours to local schools[1]. A local cop probably just stood behind one of the pilots while they flew over the property and spotted the cows.
Also: to somebody who didn't grow up in this area, that probably sounds really silly...but keep in mind that cows are worth a couple of thousand dollars each. So you're talking, low end, about $12,000 worth of property that they won't return. That's like having a stolen car.
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I think something like this (flying a UAV, since CBP doesn't actually fly drones) should require a search warrant, but this is a totally reasonable use of resources IMHO.
Don't throw the baby out with the bathwater, I guess.
[1]: They'd probably give a tour to anybody that asked, actually. Grand Forks is home to one of the biggest and best Aviation and Aerospace engineering schools in the world[2], and it would surprise me if there wasn't a relationship between the air force base there, and the school. If any HNers are ever up there, I'd suggest asking for a tour.
[2]: http://en.wikipedia.org/wiki/John_D._Odegard_School_of_Aeros...