In the 1950s, meth was available over the counter. In the 1960s, it was still unscheduled by the FDA and widely prescribed by doctors. All kinds of people – among them housewives, truckers, and college students – used the stimulant to induce weight loss, wakefulness, and high spirits. But in 1971 meth was reclassified as one of the nation’s most dangerous drugs and its legal production quickly fell by 90 percent. Demand, on the other hand, persisted, and outlaw biker gangs stepped into the supply vacuum. How’d biker gangs come to dominate the meth trade in the 80s? And why did they eventually lose control of it?