Illegal trade in performance-enhancing drugs and anabolic steroids is booming. In a Spiegel interview, investigator Andreas Holzer talks about the hidden dangers, growing use by amateur athletes and why the problem will worsen. "The doping trade is a globally networked business comparable to the drug trade — a mafia, pure and simple. " "Many compounds come from China, India or Pakistan, where production is cheap and no one gives any thought to the fact that the production process alone can be hazardous to your health. The active ingredients are sold by online suppliers — often through illegal online pharmacies — and are shipped via airmail."