If you haven't read this yet you need to. It's pretty involved as only lawyers can get but its an eye-opener.
Drone Sightings: The Actual Numbers
The following is an excerpt to whet your whistle:
" The FAA even commented on the data in the
small unmanned aircraft registration rule, “Some commenters specifically found fault with FAA’s reliance on increased number of UAS ‘incidents’ reported to the FAA by manned aircraft pilots. Several commenters noted that the AMA analyzed those reported ‘incidents’ and found that out of the 764 reported records, only 27 (or 3.5%) were identified as a near mid-air collision, with nearly all of those involving government-authorized military drones. The commenters noted that most of the ‘incidents’ have merely been sightings of UAS. One individual pointed out that the FAA has published no analysis of its own ‘sightings’ data; nor has it disputed the AMA’s analysis of that data. This individual also asserted that a doubling in the rate of UAS ‘sightings’ in 2015 is consistent with the rate of growth of consumer small UAS, and is not cause for overreaction.” "