“[T]he jury may presume that a defendant is a knowing participant in the conspiracy when he acts in furtherance of the objective of the conspiracy.”
United States v. Brown, 943 F.2d 1246, 1250 (10th Cir.1991) (citing
United States v. Tranakos, 911 F.2d 1422, 1430 (10th Cir.1990)).
See also Savaiano, 843 F.2d at 1294 (“[participation [in a conspiracy] may be inferred from the defendant’s actions”) (citation omitted).
“A single overt act by the defendant can be sufficient to connect him to the conspiracy if that act leads to a reasonable inference of intent to participate in an unlawful agreement or criminal enterprise.”
United States v. Pack, 773 F.2d 261, 266 (10th Cir.1985) (citing
United States v. Pilling, 721 F.2d 286, 292-93 (10th Cir.1983)). However, the evidence from which a defendant’s knowledge of the essential objectives of the conspiracy may be inferred must be “clear and unequivocal.”
United States v. Austin, 786 F.2d 986, 988 (10th Cir.1986).
See also Direct Sales Co. v. United States, 319 U.S. 703, 711, 63 S.Ct. 1265, 1269, 87 L.Ed. 1674 (1943);
United States v. Dumas, 688 F.2d 84, 86 (10th Cir.1982). Additionally, a conspiracy conviction requires “at least the degree of criminal intent necessary for the substantive offense itself.”
Ingram v. United States, 360 U.S. 672, 678, 79 S.Ct. 1314, 1319, 3 L.Ed.2d 1503 (1959);
Austin, 786 F.2d at 988;
Dumas, 688 F.2d at 86.
“The core of a conspiracy is an agreement to commit an unlawful act.” Esparsen, 930 F.2d at 1471. See also United States v. Falcone, 311 U.S. 205, 210, 61 S.Ct. 204, 206, 85 L.Ed. 128 (1940). Proof of an agreement rarely is susceptible to direct evidence, and may be inferred from the facts and circumstances of the case. Iannelli v. United States, 420 U.S. 770, 777 n. 10, 95 S.Ct. 1284, 1289 n. 10, 43 L.Ed.2d 616 (1975); Fox, 902 F.2d at 1514; U.S. v. Kendall, 766 F.2d 1426, 1431 (10th Cir.1985). “[T]he critical inquiry is whether the circumstances, acts, and conduct of the parties are of such a character that the minds of reasonable men may conclude therefrom that an unlawful agreement exists.” Kendall, 766 F.2d at 1431.
In determining whether an agreement can be reasonably inferred from “the circumstances, acts, and conduct of the parties,” we recognize that a defendant’s “guilt is always dependent on personal and individual conduct, not on mere association or unknowing involvement.” United States v. Horn, 946 F.2d 738, 741 (10th Cir.1991) (citing Kotteakos v. United States, 328 U.S. 750, 773, 66 S.Ct. 1239, 1252, 90 L.Ed. 1557 (1946); United States v. Harrison, 942 F.2d 751, 755-56 (10th Cir.1991); Fox, 902 F.2d at 1514). In order to reasonably infer such an agreement, the Defendants’ conduct must be interdependent with the conduct of the alleged coconspirators. Horn, 946 F.2d at 740; United States v. Daily, 921 F.2d 994, 1007 (10th Cir.1990), cert. denied, — U.S. -, 112 S.Ct. 405, 116 L.Ed.2d 354 (1991); Fox, 902 F.2d at 1514. Interdependence is present if “the activities of a defendant ... facilitated the endeavors of other alleged coconspira-tors or facilitated the venture as a whole_” Horn, 946 F.2d at 740-41 (citing Fox, 902 F.2d at 1514). “Casual transactions” or “mere association” with persons involved in criminal activity is insufficient to establish the interdependence of a defendant’s conduct. See id. at 741. See also Fox, 902 F.2d at 1514. We cannot sustain a conspiracy conviction if the evidence does no more than create a suspicion of guilt or amounts to a conviction resulting from piling inference on top of inference. Direct Sales, 319 U.S. at 711, 63 S.Ct. at 1269; Fox, 902 F.2d at 1513.
A.
Hill, who was convicted solely of count 2, the firearms conspiracy, makes two arguments concerning the sufficiency of the evidence. First, he contends that there was no evidence that he knew or should have known of the marijuana cultivation, distribution and possession. Second, he contends that there was no evidence of an agreement to use or carry firearms during and in relation to the commission of a drug trafficking offense.