"In the United States, someone injured by a small drone would have a strong case against the person remotely flying it, even if the injured party was simply startled by the drone and fell down, Ryan Calo, an assistant professor of law at the University of Washington, told NBC News.
It’s not that different from lawsuits involving any other product. The story might be different, however, if the drone was hacked.
“Then the person who hacked the drone would be responsible, not the operator,” Calo said. “The person flying it could be off the hook then. But it would be the operator’s obligation to prove it.”"