Fraudulent billing and fake patients were just some of the violations the Center for Investigative Reporting dug up when it started investigating publicly-funded drug rehab clinics in Los Angeles County.

The investigation dubbed Rehab Racket found centers were being run by operators with criminal pasts and allegations of criminality separate from the treatment centers.

Reporter Will Evans, who co-reported the story with Christina Jewett and in partnership with CNN, talked to us about some of the stories they uncovered.