(Monmouth, IL) — Investigators in western Illinois are proud of their latest drug bust. Police in Monmouth alongside the Warren County Sheriff’s office yesterday said that they arrested Sean Billingsley from Oregon with 200 pounds of marijuana in his plane at the Monmouth Municipal Airport. Police say they made the bust Tuesday, they say they also found almost three thousand-dollars cash and a pistol. Billingsley is being held on a quarter-million dollars bond.