Watch the opening scene from FRONTLINE's new documentary “Drug War in Ecuador,” which examines how a once-peaceful nation is now gripped by drug cartels, violence and a military crackdown. As the documentary begins, follow Father José Antonio Maeso, a well-known gang violence mediator in Ecuador, as he works in violence-scarred neighborhoods and also collects evidence of alleged abuses by the police and military. Tune in or stream the full documentary tonight on PBS stations, our website, YouTub