Cite as: 515 U. S. 389 (1995)
Opinion of the Court
January 25 through February 8, 1991, thus covering only the later marijuana transaction. On February 21, 1992, Witte pleaded guilty to the attempted possession count and agreed to cooperate "with the Government by providing truthful and complete information concerning this and all other offenses about which [he] might be questioned by agents of law enforcement," and by testifying if requested to do so. App. 14. In exchange, the Government agreed to dismiss the conspiracy count and, if Witte's cooperation amounted to "substantial assistance," to file a motion for a downward departure under the Sentencing Guidelines. See United States Sentencing Commission, Guidelines Manual § 5K1.1 (Nov. 1994) (USSG).
In calculating Witte's base offense level under the Sentencing Guidelines, the presentence report prepared by the United States Probation Office considered the total quantity of drugs involved in all of the transactions contemplated by the conspirators, including the planned 1990 shipments of both marijuana and cocaine. Under the Sentencing Guidelines, the sentencing range for a particular offense is determined on the basis of all "relevant conduct" in which the defendant was engaged and not just with regard to the conduct underlying the offense of conviction. USSG § 1B1.3. The Sentencing Commission has noted that, "[w]ith respect to offenses involving contraband (including controlled substances), the defendant is accountable for all quantities of contraband with which he was directly involved and, in the case of a jointly undertaken criminal activity, all reasonably foreseeable quantities of contraband that were within the scope of the criminal activity that he jointly undertook." USSG § 1B1.3, comment., n. 2; see also USSG § 2D1.1, comment., nn. 6, 12. The presentence report therefore suggested that Witte was accountable for the 1,000 pounds of marijuana involved in the attempted possession offense to which he pleaded guilty, 15 tons of marijuana that Witte, Mason, and Pokorny had planned to import from Mexico in
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