Two suspects were arrested on drug charges in Red Oak on Monday after completion of a narcotics investigation.  At 9:41pm Monday officers arrested 23-year-old Jessica Renee Graham of Essex and 30-year-old Montana Wayne Kroupa of Omaha, NE at the intersection of North Broad and East Washington Streets in Red Oak.  Graham was charged with two counts of Conspiracy to Deliver Controlled Substance Marijuana and Operating While Intoxicated Drugged 1st Offense.  Kroupa was charged with two counts of Delivery of Controlled Substance Marijuana and Possession of Drug Paraphernalia.  Both suspects are being held at the Montgomery County Law Enforcement Center on $5,000 cash bond.