Overview: The Pot Republic: FRONTLINE and The Center for Investigative Reporting team up to investigate California's marijuana market. Doctor Hotspot: Dr. Jeffrey Brenner and his team are pioneering a practice called “hotspotting,” in which medical care is focused on the hardest-to-treat to improve their health and dramatically reduce costs. The Atomic Artists: FRONTLINE with PRI’s The World meet Chim?Pom, a provocative group of young artists using art to challenge the status quo and ask Japan to rethink their way of life.