So? They're unarmed. It's about as dangerous as a TV helicopter videoing you driving.
1) http://en.wikipedia.org/wiki/Posse_Comitatus_Act
2) http://www.opposingviews.com/i/society/crime/north-dakota-po...
Not saying the military should be directly involved, but I can see some org dedicated to finding rustlers using this technique as an option, if it's effective.
The military is not supposed to be directly involved in civilian law enforcement. Effective is not a consideration at that point. It would cut crime a lot to have troops on every corner of Detroit, but that is not something that is good long term for the citizens of the US.
Thankfully, that won't happen: http://nakedsecurity.sophos.com/2012/07/02/drone-hackedwith-....