Customs Anti-smuggling Act Article 15

When enforcing the duty of suppressing smuggling, Customs officers shall wear uniform, badge, or other certificates sufficient to identify themselves.
中文原文 海關緝私條例第15條
海關關員執行緝私職務時,應著制服或佩徽章或提示足以證明其身分之其他憑證。

English translation for reference only; the Chinese text prevails. Not legal advice.