(b) To the extent that amounts realized from such collections exceed $31,000,000, those amounts in excess of $31,000,000 shall be credited to this appropriation, to remain available until expended. 205. None of the funds made available in this Act for U.S. Customs and Border Protection may be used to prevent an individual not in the business of importing a prescription drug (within the meaning of section 801(g) of the Federal Food, Drug, and Cosmetic Act) from importing a prescription drug from Canada that complies with the Federal Food, Drug, and Cosmetic Act: Provided, That this section shall apply only to individuals transporting on their person a personal-use quantity of the prescription drug, not to exceed a 90-day supply: Provided further, That the prescription drug may not be— (1) a controlled substance, as defined in section 102 of the Controlled Substances Act ( 21 U.S.C. 802 )