I'm reading all this and really trying not to laugh. The only performance enhancement I can think of is a better engine, fuel, prop, wing design, etc. So just what drug could I personally take to get me into the top 5 at the NATS. Tylenol for my back ache? I don't need big muscles to handle the model due to rules that keep them from becoming that big. I'm too old for a growth hormone, I'm pretty much stuck at 5' 7" on a good day. No other growth is needed. (Wifes opinion and why I love her).
Isn't it bad enough the damn UN is trying to take over our country and now the FAI is going take over the AMA and us. Screw the FAI.

It would be funny if it weren't taking something simple that a lot of people care about, and making it impossible.
By the way, the FAI is the self-appointed (near as I can tell) "world organization" for all airplane and space-related activities. This led to absurdities like the Apollo astronauts having to get an FAI Sporting License to get their altitude records (and other records made up for the event) "recognized" as world records. The FAI is a collection of "National Aero Clubs". The NAA, National Aeronautic Association, is the recognized "National Aero Club" for the US. This includes all aviation activities. There are clubs underneath that for various things. The largest single club, BY FAR, is the AMA. I don't have the numbers but at one time it was 2x or more the total of all the rest.
So, effectively, the AMA is far and away the largest block of members in the FAI. However, every teeny little country in the world including places where 2 guys fly airplanes and another likes to look at magazines gets the same representation as the US. I also suspect if you look at the dues money it would be disproportionately from the US - just like the UN. And just like the UN, the process for imposing things like this is opaque, not responsive to the members, and is controlled by a tiny few, mostly non-participants.
Stunt has been pretty good, you should see what goes on in the model rocket divisions, it's a joke, and it's controlled by a few Eastern European countries, blatantly, to make it very difficult for anyone else to have a chance. The US has done fairly well despite this, but most of the event rules are so completely rigged that the events are of no interest to the average modeler. As an example, how would you like to prepare for a WC but not be able to test-fly anything before you arrive, and buy your engine, sight unseen, at the event?
I see no indication that there is anything like drug testing required for any AMA contest, so the solution seems to be to forget about these stupid little FAI contests and just go to the NATs. Saves travel, saves having to build take-apart models, saves BOM. Most people weren't going to go to a WC anyway. I turned down a chance in 2009 due to other commitments and may have never gotten another chance anyway. But for those who wanted to do this, this is the end, I suspect.
And as far as I can tell, we no longer need the FAI for anything. I can set up a contest and call it whatever I chose, and if enough people come to it, it will be a de facto WC anyway. Recall that the only thing you get from any hobby contest is the recognition of your peers. That can be achieved WITHOUT the FAI.
Brett