Sharing an abode does provide alot of opportunity, is all. Provided my assumptions aren't ass-backwards, it is more than possible.
I'd written a reply earlier, but it seems to have dissappeared. Basically, Marion Jones was the best in the world long before she started going out with Tim Montgomery. If she's been taking drugs, its likely she was taking them from the start, I'd have thought. Why would you start to take drugs when you're already completely dominant? (Also, Marion Jones previous husband was CJ Hunter, the American shotputter, who was also banned for steroid abuse. Him testing positive was all a conspiracy attempt to disrupt her at the Sydney Olympics, according to the pair of them at the time.)
Why would you start to take drugs when you're already completely dominant? because you can't dominate forever?
Why would you start to take drugs when you're already completely dominant? because you can't dominate forever? And "forever" comes a lot sooner than the natural aging process if a bunch of your competitors start juicing. Then, no matter what you do, you may find you can't be clean and competitive. This is the dilemma that elite athletes face, especially in endurance sports, and what the drug regs were created to address. Unfortunately, as with most regulations and institutions, they've partly lost sight of their original purpose. You can really see in some of the rulings that they seem to have forgotten what it was all about.
SpoFites, why do you hate druggin'?