The idea that any doctor working in sports medicine for over a decade wouldn't know that testosterone could be used for doping seems absolutely ridiculous to be honest. Not least because it would mean they could be prescribing banned substances to athletes, resulting in their suspension.But your father-in-law, I take it, doesn't work for a cycling team. If i worked for any kind of pro sports team, in any kind of capacity, I would have a good working knowledge of the recent history of that sport. Maybe that's just me, but I can't see how you wouldn't, regardless of whether you were a fan or had any interest in who won or lost. It's just basic background.