The point was to bring up the possibilities so that JREF won't be taken by a clever con. You obviously still don't believe it can be done so you wouldn't know how to take the necessary precautions to prevent it.
If a psychic were to pass the preliminary test they would probably be too busy making their own millions to bother with the final test.
I respect what you're trying to do, I just happen to think that you're completely off-track. There is certainly a chance that someone will try to cheat to pass a preliminary test, but if that happens and that person is challenging for the NZ challenge, I can guarantee that no cheating will take place by use of electronic devices.
I also think that you're off-target with the type of equipment it would be done with. Personally, I'd favour using smart fabric - placed in a jacket or shirt collar/cuff, it would be invisible through visual searches and would require no other people than the tester & receiver. (Or one of several other means that has been pointed out to me.) When it comes to electronics, the "ON" button is about my go, but I work with one of the top electronics consultanting companies in the world and have them available to call on if needed. I am aware of the possibility of cheating and am certainly set up to catch any attempts via any means.
I'd like to think that JREF, with vastly more experience than anybody at this game, also has all angles covered.
Given the knowledge of Randi, his past and his accomplishments, I just cannot imagine anyone being stupid enough to try to cheat. Apart from anything else, attempting to cheat, even at a paranormal challenge, wtill counts as serious fraud in this country, given the pecuniary advantage of a successful cheat.
I'd love someone to try, and I bet James would as well. A failed challenge won't make any headlines, but a challenger arrested and taken away by the Serious Fraud Squad while having a go at it sure as hell would.