You don't think Lesnar and/or Batista ever took steroids? Come on, John Morrison (Johnny Nitro, etc) got busted for winny, and Edge has admitted he's taken them....
I can't attest that they never took steroids no cause batista before becoming a wrestler was a 300 lbs. + bodybuilder. And William Regal tested positive for steroids although his clear appearnce you wouldn't know. The guy looks like he never works out.
I only doubted Lesnar, but WWE is an entertainment franchise and not a sports franchise they have used steroids historically for quite sometime, Hulk Hogan, Stone Cold (allegedly), Booker T, Kane.
But if you look at Lesnar's college photos, he's always looked that way, NOW! in no way can I prove beyond a reasonable doubt that he wasn't using then nor can you prove on the other spectrum Brock Lesnar specifically, IS using.
My doubts are built upon personal trust in his genetic make up and work ethic.