Adolph Jackson entered a plea of guilty to one count of Possession with Intent to Distribute Five Kilograms or More of Cocaine in violation of 21 U.S.C. § 841(a)(1) and (b)(1)(A)(ii)(II). He appeals from a judgment imposing a sentence of 132 months. Jackson argues that the district court improperly concluded that an earlier incident of uncharged conduct four years before the offense of conviction was in the same “course of conduct” and was thus appropriately included as “relevant conduct” for the purposes of determining the base offense level under U.S.S.G. § 1B1.3. We reject appellant’s argument and affirm his sentence.
I. Background
Adolph Jackson was arrested as a result of a reverse sting operation facilitated by the cooperation of Rayful Edmond. Edmond, a purported drug lord, had been convicted of various federal narcotics offenses in 1990, and received concurrent sentences of life without parole. See
United States v. Edmond,
In 1996, Adolph Jackson became the target of one such reverse sting. Edmond claimed that he had arranged a large drug transaction between Jackson and the Colombians in 1992. The government planned the sting so that Jackson would be led to believe that he was transacting with the same Colombian parties he had in 1992, with Edmond as intermediary. The sting was successful, and Jackson was arrested on August 7, 1996. A two-count indictment was filed the next day, charging him with one count of Conspiracy to Possess with Intent to Distribute Five Kilograms or More of Cocaine in violation of 21 U.S.C. §§ 846, 841(a)(1) and 841 (b)(1)(A)(ii)(II), and one count of Possession with Intent to Distribute Five Kilograms or More of Cocaine in violation of 21 U.S.C. §§ 841(a)(1) and 841(b)(1)(A)(ii)(II). On November 1, 1996, Jackson entered a plea of guilty to the second count of the indictment.
On April 1 and 2, 1997, the district court held a sentencing hearing which focused on whether Jackson’s alleged 1992 drug transaction would be considered “relevant conduct” for the purpose of establishing his base offense level under U.S.S.G. § 1B1.3. The government presented two witnesses at the hearing, Rayful Edmond and Detective Gonzalez, a D.C. police officer. Edmond testified regarding the 1992 transaction and its similarity to the feigned 1996 transaction. He explained that the Colombians with whom he arranged his transactions from prison were “Chickie” and “Negro” Trujillo-Bianco, and that a representative of the Colombians named Memo would typically meet with the D.C. parties in New York City to complete the transaction. According to Edmond, he arranged a transaction between defendant and the Colombians in 1992. Edmond testified that the 1992 transaction involved the purchase of 25 kilograms of powder cocaine by defendant and his then partner, Marcus Haynes, who was the subject of a separate reverse sting. Jackson and Haynes allegedly received the cocaine from Memo in a meeting in New York City in July or August of 1992. Edmond further testified that while he was not present at the actual transaction, prior and subsequent conversations with the parties involved confirmed that the transaction had been completed. According to Edmond, *26 Jackson and Haynes were not entirely satisfied with Memo as intermediary due to late changes he had made in the deal. Edmond testified that shortly after the 1992 transaction, Chickie was killed, and Negro went into hiding, so that further transactions with them were not possible at that time. Portions of Edmond’s testimony were supported by recordings of his phone conversations from prison.
Both Edmond and Detective Gonzales testified regarding the 1996 sting. Edmond explained that he contacted Jackson in 1996 and led him to believe that contact with Negro had been reestablished and that there was a new intermediary with whom a deal could be transacted. Detective Gonzales was the undercover officer who posed as the “new Memo” in the 1996 transaction. In his testimony at the sentencing hearing, Gonzales explained that he structured the 1996 transaction to parallel the 1992 transaction. Gonzales testified that he met with Jackson in a Newark hotel, and that Jackson did not seem confused or surprised when Gonzales mentioned Chickie and Negro during that meeting. The 1996 transaction involved ten kilograms of cocaine.
The district court concluded that the government had established that the 1992 transaction was relevant conduct under U.S.S.G. § 1B1.3. Since the 1992 conduct was deemed relevant, the defendant was responsible not only for the ten kilograms involved in the 1996 transaction, but for the twenty-five kilograms involved in the 1992 transaction. This increased defendant’s base offense level from 32 to 34. After an adjustment for acceptance of responsibility, the defendant had an offense level of 31. With a criminal history of 2, this led to a sentencing range of 121 to 151 months. The judge imposed a sentence of 132 months, from which Jackson appeals.
Jackson argues that his alleged 1992 drug transaction should not have been used to determine his base offense level under § 1B1.3. He makes two arguments: first, that more than a simple preponderance should have been required to establish the 1992 transaction, and second, that the 1992 transaction is too distant in time to be considered part of the same course of conduct as the 1996 offense.
II. Standard of Proof at Sentencing
The preponderance standard for factual determinations at sentencing is suggested by the Guidelines themselves,
see
U.S.S.G. § 6A1.3 (Policy Statement) commentary. The Supreme Court has held that the application of the preponderance standard at sentencing generally satisfies due process.
McMillan v. Pennsylvania,
To support his argument that a higher standard of proof should have been required, appellant cites
United States v. Shonubi,
III. The Relevant Conduct Determination
Appellant’s argument that the 1992 transaction is too distant in time to be considered part of the same course of conduct as the 1996 offense under U.S.S.G. § 1B1.3 is more troubling. However, applying the law of Guideline sentencing to the facts of record, we conclude that this argument also fails.
A. The Course of Conduct Test
U.S.S.G. § 1B1.3 defines “relevant conduct” for determining an offender’s base offense level. Subsection (a)(1) provides that unless otherwise specified, the base offense level shall be determined based on acts or omissions occurring “during the commission of the offense of conviction, in preparation for that offense, or in the course of attempting to avoid detection or responsibility for that offense.” For certain specified offenses for which the sentence depends substantially on quantity, primarily certain property, tax, fraud, and drug offenses, the Guidelines allow consideration of a broader range of conduct. See U.S.S.G. § 1B1.3 background note;
United States v. Boney,
The Guideline’s application notes address the question of what constitutes a “course of conduct” or a “common scheme” within the meaning of U.S.S.G. § lB1.3(a)(2). Application note 9(A) provides that “[f]or two or more offenses to constitute part of a common scheme or plan, they must be substantially connected to each other by at least one common factor, such as common victims, common accomplices, common purpose, or similar
mo-dus operandi.”
U.S.S.G. § 1B1.3 application note 9(A). Application note 9(B) provides that offenses that do not qualify as a common scheme or plan may nonetheless be within the “same course of conduct” if they are “sufficiently connected or related to each other as to warrant the conclusion that they are part of a single episode, spree, or ongoing series of offenses.” U.S.S.G. § 1B1.3 application note 9(B). Factors appropriate to determining whether or not offenses are part of the same course of conduct include “the degree of similarity of the offenses, the regularity (repetitions) of the offenses, and the time
*28
interval between the offenses.”
Id.
When one of the factors is absent or weak, a stronger presence of at least one of the other factors is required.
Id.; Pinnick,
The district court in this case concluded that the 1992 and 1996 transactions were part of the same course of conduct. The court recognized that the four-year interval between the 1992 and 1996 conduct made the time element weak, but concluded that the strong degree of similarity between the two drug transactions made them part of a single course of conduct.
B. Standard of Review
A sentencing court’s determination that particular conduct is relevant to the offense of conviction is in many cases a factual question that we review for clear error.
See, e.g., Pinnick,
C. Analysis
Appellant argues that the four-year time interval between the 1992 and 1996 transactions renders both the regularity prong and the temporal prong of the test very weak, and that similarity alone cannot justify a finding of a course of conduct. While we have stated that no single factor is dispositive in determining whether earlier offenses are part of the same course of conduct,
Pinnick,
Traditionally, what conduct to consider in sentencing was left to the sentencing judge’s discretion. Before the imposition of the Guidelines, it was a recognized principle that “ ‘a judge may appropriately conduct an inquiry broad in scope, largely unlimited either as to the kind of information he may consider, or the source from which it may come.’ ”
United States v. Grayson,
Congress’s failure to impose defined limits on what may constitute a course of conduct certainly does not mean there are no limits, only that they must be determined on a case-by-case basis. While we find nothing in § 1B1.3 which necessarily precludes a district court judge from finding a course of conduct based primarily on similarity, we must consider whether it was appropriate to do so in the present case. Here, the “degree of similarity” between the 1992 and 1996 deals is strong. Each was brokered by Rayful Edmond; each involved, either actually or in Jackson’s perception, a transaction between Jackson and the Trujillo-Blancos; each involved a meeting with an intermediary in the United States; and each involved the transfer of large quantities of cocaine. However, the four-year interval between the two transactions makes the time and regularity prongs quite weak.
Previous cases addressing the appropriateness of finding a course of conduct have not dealt with situations combining such strong similarity with such a long time interval. A number of cases involving lengthy time intervals have held that the earlier offense was not part of the same course of conduct, but in each of those eases, the similarity was weaker than in this ease. In
United States v. Mullins,
Other cases have found a course of conduct under § 1B1.3 despite a significant lapse of time, but in these cases, the time and regularity prongs were stronger than in this ease. In
United States v. Wishnefsky, 7
F.3d 254 (D.C.Cir.1993), we held that where embezzlement occurred continuously from 1980-1990, the entire period constituted one “course of conduct” and could be taken into account in setting the base offense level, even though the statute of limitations had run on all but the 1987-1990 embezzlement. In
United States v. Moore,
The case most similar to this one is
United States v. Cedano-Rojas,
While the facts of Cedano-Rojas are similar to those here, the time interval in the present case is two years longer. A four-year time interval makes the temporal factor weak, and in many cases might be difficult for another factor to outweigh. Two incidents four years apart are hardly the prototypical “course of conduct.” However, as application note 9(B) indicates, the nature of the offense is a relevant consideration in determining whether there is a course of conduct. U.S.S.G. § 1B1.3 application note 9(B). In this case, the transactions in which Jackson was involved were extremely large international cocaine deals. It is hardly reasonable to anticipate that such transactions would be carried out with the same frequency as might be expected from smaller drug transactions. In addition, as in Cedano-Ro-jas, the lapse of time does not evidence a voluntary cessation of activity by the defendant. Here, Jackson’s Colombian suppliers, the Trujillo-Blancos, were allegedly unavailable between 1992 and 1996, making transactions with them during that time impossible. In addition, Edmond’s continued imprisonment surely imposed at least some constraint on the number of deals he could broker for the defendant. Therefore, giving due deference to the trial judge’s decision, and in light of the extreme similarity between the 1992 and 1996 conduct in this case, we hold that the district court was justified in considering the 1992 conduct in establishing Jackson’s base offense level under U.S.S.G. § 1B1.3. We make clear, however, that this result rests heavily on the nature of the 1992 and 1996 transactions and their extreme similarity. A “course of conduct” is not a limitless concept, and the limits are approached in this case.
IV. Conclusion
Given the nature of the 1992 and 1996 transactions, and their extreme similarity, the district court’s decision that Jackson’s 1992 conduct was relevant conduct under U.S.S.G. § 1B1.3 was justified. We therefore reject appellant’s arguments, and affirm the sentence imposed by the district court.
