Gonzalez-Quezada v. United States

holding that district court did not have authority pursuant to § 5K2.0 to depart downward to reflect discharged state sentence | holding that under comparable 21 U.S.C. § 853, also enacted by the Comprehensive Crime Control Act of 1984, because defendant’s continuing criminal enterprise continued after Congress' amendment to the forfeiture statute, the amended statute applies | “Agreements to exchange cooperation for transactional immunity are governed by traditional principles of contract law ....”