The Tenth Circuit affirmed the 77-month prison sentence imposed on Glen Delane Arnett, Jr. for unlawful possession of a firearm by a felon in violation of 18 U.S.C. § 922(g)(1). The court reviewed the district court’s application of a four-point sentencing enhancement under U.S.S.G. § 2K2.1(b)(6)(B) for plain error, as Arnett failed to preserve these arguments below. The court applied the four-prong plain-error standard: (1) error, (2) that is plain, (3) affecting substantial rights, and (4) seriously affecting the fairness, integrity, or public reputation of judicial proceedings. First, the court agreed that the district court committed error by using a “factual approach” rather than the “categorical approach” to determine if Arnett’s prior state drug convictions qualified as a “drug, narcotic, or chemical offense” under 21 U.S.C. § 844(c). The court held that the statutory term “proscribes” mandates the categorical approach, which looks only at the elements of the prior statute rather than the underlying facts. However, the court found this error was not “plain” because two unpublished Tenth Circuit decisions (*United States v. Shaw* and *United States v. Simmons*) previously held that the categorical approach does not apply to § 844, rendering the legal landscape unsettled at the time of sentencing. Regarding Arnett’s alternative argument that the district court applied the wrong legal standard for constructive possession (failing to require proof of intent to exercise control), the court assumed without deciding that such an error occurred and was plain under *Henderson v. United States*. Nevertheless, the court held that Arnett failed to satisfy the third prong of plain-error review because he could not show a reasonable probability that the outcome would have been different. The court concluded that the evidence—Arnett being the sole occupant of the vehicle, the marijuana’s open and obvious presence, its proximity to him and the firearm, and his admission to officers that marijuana was in the car—was sufficient to support a finding of intent to exercise dominion and control over the drugs under the correct legal standard. Consequently, Arnett could not demonstrate that the alleged error affected his substantial rights or resulted in a lesser sentence.