said by Kearnstd:
Guessing the FAA can trust the pilot to shut off the radios more than a passenger. I bet its impossible to detect an operating iPad outside of a shielded lab when all its radios are off. if you where to set an ipad in this room I am in all radios off I bet any detection gear would pick up the motor in my ceiling fan first.
ever use a portable am radio and walk around your house? i know this is a bit extreme but, i cant set my weather radio with in 5' of my 22" lcd tv because of the RFI from the light in it. i happen to have a portable "air band" radio, you cant use it in the house because of the CFL's.
now, i will grant you the RFI emitted from those examples are magnitudes higher than that of a cellphone/ipad screen, and i seriously doubt they put out enough interference to cause harm to an airplane radio especially considering how much RFI the inflight entertainment probably pumps out..