But while the system works, it's already running into a legal barriers. The broadest problem comes from the FAA: for the time being, drones are classified as aircraft, and it's a federal offense for anyone to interfere with the operation of an aircraft in mid-flight — even police. The FAA is still new to the business of regulating drones, and many are expecting some kind of carveout that distinguishes lightweight drones from 2-ton airplanes, making the concerns more theoretical than practical. Battelle says in private conversations, the FAA has been positive toward the device. Still, the aviation issues have been enough to scare many companies away from the category.