The FAA is expected to announce plans to expand the use of domestic drones in American airspace. These would be similar to the unmanned aircraft that the U.S. has been using to target terrorists abroad. In the U.S., the surveillance systems would be used to track terrorists, drug dealers or to find missing children. But critics warn that the use of drones presents a major threat to our personal privacy. Jonathan Hunt reports that there could be as many as 30,000 drones flying overhead within the next decade.