YANKTON, S.D. (MITCHELLNOW)A Yankton man will spend 20 years in prison on felony drug charges. Attorney General Marty Jackley says 31-year-old Calahan Stark was sentenced in Yankton County Circuit Court after pleading guilty to possessing cocaine and fentanyl with intent to distribute, and to bringing drugs into jail. Jackley said drug traffickers will face serious consequences, while State’s Attorney Tyler Larsen called the amount of drugs seized alarming. The case was investigated by state and local law enforcement. For more crime stories from MitchellNow.com, click here