"There are already some police and security robots in use around the world, ranging from surveillance robots to prison guards to a lethal remote-controlled rover in use in Israel. But there don’t seem to be any laws regulating robots using nonlethal force. Ryan Calo, law professor at the University of Washington, said we’re not likely to see any legislation from Congress.
“In order for something to be a federal matter, there has to be a hook,” said Calo. “What’s more likely is a municipality or a state would prohibit it.”"