the only people who are "natural" in those shows are the ones who look out of place in a line up... you know, when you see someone and say "WTF is he doing there?"
I have friends who compete in the arabian championship (3 of them) and one competed in the asian championship and won the overall... they are ALL loaded on shit you can't imagine... 2 of them showed me their plans and it all revolves around stuff "we" don't usually use... they don't use long acting substances THE YEAR of the show... as in, if the show is december 2009, they stop using deca, primo, enanthate, sustanon... etc by the end of 2008... one of my friends didn't compete in the arabian championship this year and his reason was "I used primo 8 months ago, i'm not gonna depend on luck to pass the test"...
don't you notice how people in the worlds championship have a different look to their physique as opposed to the NPC and the IFBB pro stage? they use very harsh stuff that hits quick and is out of the system really fast.
Team universe is the same, and you can see that from the look they have. look at all of them, they are dense, shredded, have paper thin skin, and striations all over... a look i can't quite describe but i think you know what i mean.
All i know is that 6 months out of an international tested contest, my country's team and team coaches hold meeting 6 months out to discuss how to pass the test and what not to use... i've been told this by people who compete, and one of the guys was actually tested, passed, and he was on a ton of shit until 15 days out.
IMO, to make it natural would make it boring and a lot less impressive. drug tested, to me, puts a new challenge in and tells you that there is a lot more that goes into it.