The Olympics, the Tour de France, international athletes and Americans, professionals and amateurs — regardless of the sport, regardless of the nationality, lately, it seems we can’t go more than a few months, or even weeks, between doping scandals.

The latest story centers on a clinic in Miami that allegedly sold performance enhancing drugs to several high-profile professional baseball players, including Yankees player Alex Rodriguez, who denied the charges in a statement yesterday.

Has doping always been this prevalent in athletics? Is it just easier to uncover now? Or is doping simply becoming the norm?

Dr. Harvey Shapiro is a physician, medical correspondent, and former doping control officer for the Olympics.