The blistering inside story of a startup that made millions pushing opioids--until its cutthroat tactics were exposed and its executives put behind bars John Kapoor had amassed a small fortune in pharmaceuticals when he conceived of a new product. It was the 2000s, and opioids were big business. If Kapoor, an immigrant and the billionaire founder of Insys, could find a new way to administer the highly potent fentanyl, he could patent his invention and…