ORIGINAL: da Rock
I understand that the Federal requirements for the design of all those devices has a stipulation that every one must absolutely reject interference from all others to the extent that their specified purpose be completely secure.
Actually, the Federal regulations state that each piece of equipment cannot CAUSE interference with other devices, but if you get 'hit' by interference, you just have to take it. That is, the user has no recourse if they are hit with interference, such as another device on the same frequency. This is unlike other radio services, where if you have interference, you can apply to have it alleviated.