21 U.S.C. § 211
Every person, firm, or corporation whose permanent allegiance is due to the United States owning, partly owning, or managing a drug store or pharmacy shall keep in his place of business a suitable book or file, in which shall be preserved for a period of not less than three years the original of every prescription compounded or dispensed at such store or pharmacy, or a copy of such prescription, except when the preservation of the original is required by section 207 or 208 of this title. Upon request the owner, part owner, or manager of such store shall furnish to the prescribing physician, or to the person for whom such prescription was compounded or dispensed, a true and correct copy thereof. Any prescription required by section 207 or 208 of this title, and any prescription for, or register of sales of, substances mentioned in such sections shall at all times be open to inspection by duly authorized consular officers in the consular districts of the United States in China. No person, firm, or corporation whose permanent allegiance is due to the United States shall, in a consular district, compound or dispense any drug or drugs or deliver the same to any other person without marking on the container thereof the name of the drug or drugs contained therein and directions for using the same.
21 U.S.C. § 211