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19 CFR §112.43

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The identification card shall be issued on Customs Form 3873 and shall not be valid unless signed by the employee and a Customs officer and the U.S. Customs seal is impressed thereon. The holder shall encase the card in protective transparent plastic so that both sides are clearly visible.