yeah i wish people would laugh more at my weed comment, but since nobody is saying anything in here about this i guess ill speak up from the medical point of view.
steroids cause a lot more problems than you think, including the structural weakening of things like bones and connective tissue. along with other issues, i doubt that blatant or over the top steroid use is a big problem in this sport, mostly because of the health issues. you have to be flexible, as well as have a body resistant to impact, which steroids would not be conducive too.
a lot of you are also only thinking of anabolic steroids. i think that those are probably out of the picture. maybe something more along the lines of, loosely prescribed cortisone shots or something, would be more realistic. remember simon crashing to flat from 40ft out of the QP last year? i think his doc did something like that to his heels. either way, its not our place to guess what these athletes do with their own docs. they could be getting something that is considered "performance enhancing" for a prior or current injury. of course this blurs the ethical lines if they compete while on the substance.
for a sport with no money and most athletes in their late teens/early twenties, as well as the competition being based on things that performance enhancing drugs usually do not help, i think its probably not the biggest issue.
as for testing, i do think it would help the legitimacy of the sport, although they always throw in all "illegal" substances, including your run of the mill pot and coke and shit, which of course many many athletes in the x games would fail.