Former CEO of Little Rock Diagnostic Clinic Pleads Guilty to Drug Charge by Mark Friedman Posted 12/18/2012 11:50 am Updated 5 years ago James Derek Johnston, the former CEO of the Little Rock Diagnostic Clinic, waived indictment and pleaded guilty in U.S. Federal Court to one count of obtaining hydrocodone by fraud. Want the Full Article? Get Unlimited Archive Access for $19.95 per Year Readers must pay to access stories older than 15 days. Purchase Now Already have archive access? Login to view this article.