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Let me talk about the difficulties of making certain that nothing is being interfered with on the plane by people's electronics.
A device may be designed and tested to operate on a certain frequency that causes no problems. Then because of failure in the device, other frequencies including harmonics are produced that weren't expected.
The best way to prevent something in the passenger cabin from interfering with the cockpit is to electrically shield them from each other, but then there might be cables in the body of the plane that could be affected by signals from the passengers or for that matter from the cargo area. Radio interference isn't what it used to be but it hasn't gone away.
Some of you may have experienced some of it when you heard another caller on your house phone or cell phone. Likewise, you might have heard a CBer or a Radio Telephone on your TV or radio.
Sometimes this is called "cross talk." These same signals might interfere with devices that aren't powering audio circuits and then you might not know about it immediately.
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