9 CFR § 590.418 - Supervision of marking and packaging.
Affixing of official identification. No official identification shall be, or caused to be affixed to or placed on any product or container except by an inspector or under the supervision of an inspector or other person authorized by the Administrator. All such products shall have been inspected in accordance with these regulations. The inspector shall have supervision over the use and handling of all material bearing any official identification.
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