In October we talked with two of the seventies’ most notorious drug kingpins: Frank Lucas, the heroin statesman ennobled by Denzel Washington in American Gangster, and Nicky Barnes, the flashy, pimp-suited dealer who spills his guts in this new-to-DVD documentary. Mark Levin's fascinating film is practically a how-to business disc, in which Barnes philosophizes at length on the art and science of slinging powder — and hurries through a quick explanation of why he ratted out his pals.