Federal authorities will prosecute the drug and gun charges that rapper Juelz Santana faces following the discovery of a loaded firearm in a bag at Newark Liberty International Airport earlier this month. Santana had faced both state and federal charges in the matter. But the state charges were dismissed this week, as Essex County prosecutors said they would defer to federal authorities.The 36-year-old rapper had pleaded not guilty to state charges. He remains jailed pending further hearings.