LAREDO — A 22-year-old man has been ordered to federal prison following his conviction of conspiracy to possess with the intent to distribute approximately 4.65 kilograms of fentanyl, announced U.S. Attorney Jennifer B. Lowery.Juan Alvarado-Vargas pleaded guilty April 5.On Thursday, U.S. District Judge Marina Garcia Marmolejo imposed a 72-month term of imprisonment to be followed by three years of supervised release. In handing down the prison term, Judge Marmolejo noted that Mexican Fentanyl is extremely dangerous and responsible for deaths all over the United States.On Oct. 3, 2021, Alvarado-Vargas attempted to drive through the Border Patrol (BP) checkpoint along U.S.