Altitude tents
What about use of altitude tents? I am not advocating anything either way with regard to them or blood doping, but I see a parrallel here. Blood doping was once legal (not illegal at least), but was later made illegal for whatever reasons. I see altitude tents as similar in that they're (currently) legal, not (properly used) dangerous to health, but could be considered an "unnatural" way of improving performance. On the other hand they are a way of leveling the playing field for those who can't afford to live at altitude or do lengthy training camps at altitude (say, for example, Aspen, Colorado...). If you banned altitude tents would you ban people from living at high elevation or doing training camps there? I think there's a gray area in what is a performance enhancement that's considered excessive or unnatural. After all, just eating and drinking correctly and getting enough sleep enhances performance. I don't think health is the only thing that distinguishes what is/ought to be "legal" or not. Using IVs for rehydration are another gray area (I think they're not allowed per UCI, but I've heard it was common for RAAM riders, and may still be).