Anyone that does take something now will be caught. The vast majority are now just well built, eat at least 5-6 thousand calories every day and spend most of their working week in the gym.
Must say if they completely relaxed the rules it'd make it dangerous but very entertaining. I know I'd pay to watch that hedgehog mascot at the other end of the stadium get taken out by a shotput and javelins end up in the carpark.