We just found the answer to a really big question that’s been bugging us for years, about why the opioid crisis has hit some places so hard while other places have been relatively protected. The answer comes in the form of new academic research, that builds upon our reporting. Specifically, a secret internal marketing document from Purdue Pharma that senior producer Caitlin Esch discovered in the bowels of a county court house. She’s on this bonus episode to talk about it.