From an article from the Wall Street Journal, Dec 30, 2015, page B1:
Regulators Weigh Satellite Tracking for Delivery Drones - WSJ
Federal Aviation Administration official Don Walker said at a public meeting earlier this month that drones flying beyond sight of operators ultimately “are likely to have ADS-B receivers.” The receivers would enable drones to sense manned aircraft and automatically avoid them. The receivers wouldn’t broadcast the drones’ location, which could confound air-traffic controllers’ view of the airspace.
Mr. Walker said ADS-B likely wouldn’t be used for drones within sight of the operator, which include virtually all drones flying today, because that would overwhelm the system’s capacity.
To me: "automatically", "receivers wouldn’t broadcast the drones’ location", "confound" and "overwhelm" sounds like a bad recipe.