9See21 U.S.C. § 841.10SeeINA § 212(a)(2)(A).11SeeINA §§ 101(a)(43)(B), 212(a)(2)(A)(i)(II).12See Matter of Casillas-Topete, 25 I. & N. Dec. 317 (BIA 2010).13INA § 212(a)(2)(C)(i).14Section 212(h)of the INA provides that the Attorney General may, in his or her discretion, waive the inadmissibility of certain aliens, including those guilty of “a single offense of simple possession of 30 grams or less of marijuana” under specified circumstances.15United States v. Flores-Montano, 541 U.S. 149 (2004).16Jefferson B. Sessions, III, U.S. Att’y Gen.,Memorandum for All United States Attorneys: Marijuana Enforcement(Jan.4, 2018).17James M. Cole, Deputy Att’y Gen.,Memorandum for All United States Attorneys: Guidance Regarding Marijuana Enforcement(Aug. 29, 2013).18U.S. Customs and Border Protection,CBP Statement on Canada’s Legalization of Marijuana and Crossing the Border(updated Oct. 9, 2018).19Luiza CH. Savage,U.S. official: Canadian marijuana users, workers and investors risk lifetime border ban, Politico, Sept. 13, 2018.