First, the Pentagon wants 20,000 soldiers deployed inside the United States by 2011 to complement local law enforcement agencies. A move that from what I'm reading comes perilously close to blatantly violating the Posse Comitatus Act.
And as if that isn't bad enough, the Pentagon is also working with a British scientist to create robot soldiers that will be deployed without risk of "committing war crimes".
So logically, it can be deduced that in the near future there is an outstanding possibility that robot soldiers - armed with lethal firepower - will be active on the streets of your hometown.
This blog has already discussed reasons why this might not be such a hot idea. Gotta wonder if the first robotosoldier that goes nuts and kills a pregnant woman will be deemed immune from lawsuit 'cuz it malfunctioned during the course of military duty (an argument that Bill Clinton tried to use to avoid getting sued when he was President). Hey, it worked for Lon Horiuchi didn't it? I don't see any reason why it won't be applicable to a droid, either.