I'm not an expert by any means, but I do believe in going to the source for as accurate as possible info on stuff like this. Consequently I've had numerous phone conversations, email exchanges etc with the past and present AMA officials whose job it is to know the right answers.

Unfortunately they do sometimes contradict themselves or each other, so sometimes it's hard to know whether they actually do understand the stuff they're explaining to us, but what I'm reporting on RCU is the latest and most consistent answer I've had from them.

Gordon