sadly the CJD/HGH link came too late for many people and supplies these days come from either bioengineered versions or different screened sources.
the bigger risk comes from those taking drugs from unlicenced sources, or overuse (anabolic steroids for one). the pro cyclists at least - if there is any crumb of comfort here - were being medically monitored and taking drugs from licenced suppliers even if illegally obtained.
STIL - I've seen likewise with young rugby players on sterioids who get all bulked up. one young lad suffered badly with compartment syndrome in his legs as his shin tendons couldn't cope with his rapidly bulked up muscles and he had to have them cut so he could walk.
Edited: 16/10/2012 at 15:10