Over the past 15 years, an epidemic of opiate addiction and overdose has swept across the country. Fueled by the spread of prescription painkiller abuse and "pill mills", rates of addiction and opiate-related deaths have skyrocketed. Here we'll take a state-by-state look at treatment admissions and deaths related to opiate painkillers and heroin since 1999, and see which areas of the nation have been the most severely affected by this deadly addiction.