While addiction is recognized as America's No. 1 public health problem, very few medical schools require or even offer education on substance use disorders. Listen in as host William C. Moyers talks with three medical students who shadowed clinicians and patients during weeklong educational "residencies" at Hazelden Betty Ford treatment centers. The students share what they learned about the pervasive, complex and treatable disease of addiction—and how to best help future patients and their families.