Why aren’t Patrick Mendes and Joshua Gilbert allowed to compete at 2012 Olympics?

Patrick Mendes and Joshua Gilbert, top Olympic weightlifters, were banned from “Average Broz’s Gymnasium” (Las Vegas, Nevada). They tested positive for forbidden preparations. Steroids were not the medicines taken by these sportsmen. They took non-steroidal medicines that are also forbidden under Code of the WADA.
Mendes tested positive for banned preparations in February 2012 before the United States Olympic Team Trials for Weightlifting set who would represent the US at the 2012 Olympic Games. He tested for HGH; as a result, he was sentenced to a ban.
Joshua Gilbert tested positive for the diuretic medication furosemide at the 2012 National Weightlifting Championships. It was in March 2012.
Furosemide is a product that is applied by those that administer steroids in order to hide usage of steroids. Furthermore, this preparation helps sportspersons to lose weight in order to correspond to certain weight classes.  Weightlifting, boxing and wrestling are sports where athletes are divided to certain weight groups.
HGH and furosemide are medicines which are prohibited by the International Weightlifting Federation (IWF). The anti-doping system of the IWF meets criteria of the WADA Code.
Mendes and Gilbert were trained by John Broz. Broz lived and trained with the well-known Bulgarian weightlifter Antonio Krastev during his career. Krastev broke a world record snatch of 216 kg in 1987. John Broz studied the Bulgarian system of trainings and brought certain methods to America. He established own training facilities in Las Vegas.
Mendes was sentenced to 2-year suspension. As for Gilbert, he was sentenced to 3-year suspension.
The bans of these weightlifters are failure for “Average Broz’s Gym”. Thus, the greatest weightlifters were not allowed to represent their home country at the 2012 Olympic Games.