umm... but seriously, we're talking about caffeine.
just about every person i know uses caffeine as a performance enhancing drug! office workers, uni students, designated drivers... need i continue? i really don't see what all the moral indignation is about! what's the difference between a player taking no-doz and having a couple of espresso coffees? in terms of caffeine dose/effect, nothing. so are you going to get all outraged over players having a strong coffee before a match because it's "unfair"? let's be serious!! if i have caffeine before work in the morning, thus making me more attentive and productive, is that unfair to my co-workers because it makes me more likely to get a promotion? no. if i take caffeine to help me study, is that unfair because it means i can study longer? of course not!
if you really want a totally level playing field, then you'd better be outraged about players who get pre-game massages, get good physio treatment, wear ice vests, use strapping to protect injuries or have better training facilities, because all of those things will affect performance just as much as taking a couple of bloody caffeine tablets! and they're not all available to all plaers equally. so why is caffeine unfair? anybody is free to take it, it's cheap, readily available, relatively safe... it's just a personal choice whether to use it or not. therefore, not an *unfair* advantage.
the players are doing something that nearly every adult in the world does... for fuck's sake it's just football. there's nothing inherently special about it which makes the use of performance aides like caffeine more morally dubious than any other human endeavour...
footballers are over-regulated anyway. those guys can't so much as scratch their arses or the media jumps on them as "sending the wrong message to the kids" or "betraying the player group" or some other dodgy cliché. i say just let them play, and do whatever is within the rules to do that to their best.