Man admits to driving under the influence of heroin. #MasonCountyNews #CourtNews By Allison Scarbrough. Editor. LUDINGTON — A 30-year-old Grant Township man pleaded guilty in 51st Circuit Tuesday, Jan. 3, to possession of heroin under 25 grams; operating a vehicle in a parking lot while under the influence of drugs; second-offense operating a vehicle while intoxicated (OWI); and probation violation.…