Notwithstanding the provisions of §§ 54.1-3446 and 54.1-3452, the drug flunitrazepam shall be deemed to be listed on Schedule I for the purposes of penalties for violations of the Drug Control Act (§ 54.1-3400 et seq.). Any person knowingly manufacturing, selling, giving, distributing or possessing the drug flunitrazepam shall be punished under the penalties prescribed for such violations in accordance with §§ 18.2-248 and 18.2-250.