Yes, documentation is required to prove a theory. While I agree that evidence suggest there is in fact no hazard we don't know what devices were used on each flight.

All I am suggesting is something like a 3x5 card where each person would indicate their seat position and what PEDs they used. The flight crew would report if any anomalies to flight systems occurred during the test period. If this was done on all flights over six months that would represent a very large amount of data and could prove that PEDs present little if any flight hazard.

I don't currently exercise the privileges of my FAA certificate but with over 20 years experience I don't think FAA will act without documented evidence they can point to limiting their liability. My idea is a easily designed testing method that would be inexpensive to document the exercise.