Darius Weems' Incredible Journey

Darius Weems, an aspiring rapper and star of the documentary, "Darius Goes West," suffers from Duchenne Muscular Dystrophy, a rare genetic disorder that results in the disintegration of muscle tissue. "Nightline" caught up with him on his 30-day "Believe" tour at schools across the country and while Darius participated in a clinical trial to help find a cure for DMD. (Courtesy Dylan Wilson)