Rules governing admission of commission of a crime involving moral turpitude also apply to admissions of commission of a controlled substances offense. Pazcoguin v. INS, 292 F.3d 1209 (9th Cir. 2002); Legal Opinion 95-4, Excludability under "Zero Tolerance Program'' of U.S. Customs Service, No. HQ 235-P (January 20, 1995).