United States v. Tyler Richard Seaberg

Court of Appeals for the Sixth Circuit·Decided February 3, 2026·No. 24-6076·Unpublished

Opinion

NOT RECOMMENDED FOR PUBLICATION File Name: 26a0070n.06

Case Nos. 24-5991/6076

UNITED STATES COURT OF APPEALS FOR THE SIXTH CIRCUIT

FILED

Feb 03, 2026

) KELLY L. STEPHENS, Clerk UNITED STATES OF AMERICA, )

Plaintiff-Appellee, ) ON APPEAL FROM THE ) UNITED STATES DISTRICT v. ) COURT FOR THE EASTERN ) DISTRICT OF TENNESSEE MASON SHELTON (24-5991), TYLER ) RICHARD SEABERG (24-6076), )

) OPINION Defendants-Appellants. )

Before: BOGGS, READLER, and DAVIS, Circuit Judges.

DAVIS, Circuit Judge. In this consolidated criminal appeal, Defendants Mason Shelton and Tyler Seaberg appeal their sentences. Shelton and Seaberg both pleaded guilty to conspiracy to distribute marijuana and conspiracy to commit money laundering. Shelton and Seaberg now challenge their sentences as procedurally and substantively unreasonable. For the reasons stated below, we AFFIRM.

I.

During the summer of 2023, the Drug Enforcement Administration (“DEA”) began investigating a suspected marijuana-trafficking organization operating in and around Chattanooga, Tennessee. The investigation led agents to Seaberg and Shelton. On July 16, 2023, agents arranged for a confidential informant (“CI”) to call Shelton about making a large purchase of

marijuana. Shelton met up with the CI later that day to discuss the sale. At their meeting, Shelton advised that his “partner, [Seaberg]” would have access to several hundred pounds of marijuana in August. (Shelton PSR ¶ 20). A few days later, Shelton invited the CI to meet over dinner to discuss the sale.

On July 26, 2023, Seaberg, Shelton and the CI gathered for dinner, and Seaberg showed the CI photographs of marijuana. Seaberg told the CI that he had several clients in the area and explained that he collects their orders and then sends a driver to California to pick up and transport the marijuana back to Tennessee. Once the shipment arrived, Seaberg would sort the marijuana and deliver the orders to his customers. Seaberg agreed to sell the CI 150 pounds of marijuana for $165,000.

Shelton later called the CI to confirm the purchase and agreed to meet on August 10, 2023, at a local Cracker Barrel to conduct the sale. Shelton and Seaberg first met at Seaberg’s residence and loaded packages of marijuana into a vehicle. Shelton instructed an unnamed co-conspirator, who was armed with two handguns, to follow them in Shelton’s vehicle to the Cracker Barrel for security in case “things went bad.” Seaberg and Shelton arrived at the Cracker Barrel while their security escort parked at a nearby Chick-fil-A. In short order, agents approached Shelton and Seaberg’s vehicle, saw the marijuana, and arrested the defendants. Authorities recovered 150 pounds of marijuana from the vehicle and found a loaded handgun belonging to Shelton under the passenger seat.

Shelton and Seaberg pleaded guilty to (1) conspiracy to distribute and to possess with intent to distribute 50 kilograms or more of a mixture and substance containing a detectable amount of marijuana, in violation of 21 U.S.C. §§ 841(a)(1), (b)(1)(C), and 846; and (2) conspiracy to commit money laundering in violation of 18 U.S.C. § 1956(a)(1)(A)(i), (a)(1)(B)(i), (h).

During sentencing, both Shelton and Seaberg objected to their respective presentence investigation reports (“PSR”). Shelton argued that he should receive a downward adjustment for a minimal or minor role under United States Sentencing Guidelines (“USSG”) § 3B1.2. The district court disagreed and denied his objection. The district court adopted the PSR’s recommendation and found a base offense level of 23. The government then moved for a downward departure based on Shelton’s substantial assistance under USSG § 5K1.1. The district court granted that motion and decreased Shelton’s offense level by three. The resulting adjusted offense level of 20 and criminal history category I placed his Guidelines range at 33 to 41 months. Shelton moved for a downward variance based on the decriminalization of marijuana in many jurisdictions, which the district court denied. After considering the 18 U.S.C. § 3553(a) factors, the court sentenced Shelton to 33 months in prison on each count, to be served concurrently.

Seaberg objected to his PSR’s recommendation for a leadership-role enhancement under USSG § 3B1.1. The district court denied this objection. It then adopted the PSR’s recommendation and found a base offense level of 25, which included the two-point leadership- role enhancement. The government moved for a downward departure based on Seaberg’s substantial assistance under USSG § 5K1.1. The district court granted that motion and decreased Seaberg’s offense level by two. From there, the district court determined a Guidelines range of 46 to 57 months based on an offense level of 23 and criminal history category of I. Seaberg moved for a variance on multiple grounds, each of which the district court denied. After considering the § 3553(a) factors, the court sentenced Seaberg to 46 months in prison on each count, to be served concurrently.

Shelton and Seaberg now challenge their sentences as procedurally and substantively unreasonable.

II.

We review both the procedural and substantive reasonableness of a sentence under the abuse-of-discretion standard. United States v. Parrish, 915 F.3d 1043, 1047 (6th Cir. 2019). “When reviewing the district court’s application of the Sentencing Guidelines, we review the district court’s factual findings for clear error and mixed questions of law and fact de novo.” United States v. Nicolescu, 17 F.4th 706, 721 (6th Cir. 2021) (citation and emphasis omitted). And we review de novo the district court’s interpretation of the Guidelines. Id. at 722.

III.

“Procedural reasonableness requires the court to ‘properly calculate the guidelines range, treat that range as advisory, consider the sentencing factors in 18 U.S.C. § 3553(a), refrain from considering impermissible factors, select the sentence based on facts that are not clearly erroneous, and adequately explain why it chose the sentence.’” Parrish, 915 F.3d at 1047 (quoting United States v. Rayyan, 885 F.3d 436, 440 (6th Cir. 2018)). Substantive reasonableness focuses on the length of the sentence. Id. A sentence is substantively reasonable if it is “proportionate to the seriousness of the circumstances of the offense and offender, and sufficient but not greater than necessary, to comply with the purposes of § 3553(a).” United States v. Vowell, 516 F.3d 503, 512 (6th Cir. 2008) (citation modified).

A. Shelton’s Sentence 1. Procedural Reasonableness—Mitigating Role Adjustment Shelton first argues that his sentence is procedurally unreasonable because the district court misapplied the Guidelines by declining to reduce his base offense level under USSG § 3B1.2. On appeal, Shelton contends that he was a minor participant in the conspiracy to distribute marijuana and, therefore, should have received a two-level downward adjustment.

Section 3B1.2 instructs sentencing courts to decrease the base offense level based on the extent of the defendant’s participation in the offense. USSG § 3B1.2. Where the defendant was “a minor participant,” the district court should decrease it by two levels. Id. § 3B1.2(b). Shelton bears the burden of showing by a preponderance of the evidence that he is entitled to a mitigating- role adjustment. United States v. Sherrill, 972 F.3d 752, 770 (6th Cir. 2020) (citing United States v. Daneshvar, 925 F.3d 766, 790 (6th Cir. 2019)). We review a district court’s denial of a mitigating-role reduction for clear error. United States v. Mosley, 53 F.4th 947, 963 (6th Cir. 2022) (citing United States v. Lanham, 617 F.3d 873, 888 (6th Cir. 2010)).

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