WASHINGTON (AP) — The growing use of unmanned surveillance “eyes in the sky” aircraft raises a thicket of privacy concerns, but Congress is getting mixed advice on what, if anything, to do about it.

A future with domestic drones may be inevitable. While civilian drone use is currently limited to government agencies and some public universities, a law passed by Congress last year requires the Federal Aviation Administration to allow widespread drone flights in the U.S. by 2015. According to FAA estimates, as many as 7,500 civilian drones could be in use within five years.