English version

warrant card

From Longman Dictionary of Contemporary Englishwarrant cardˈwarrant card noun [countable] 🔊 🔊 an official card carried by British police officers to prove that they belong to the police
Examples from the Corpus
warrant cardAs he passed the bar he briefly held up what Lucy assumed must be his warrant card.His latest victim was punched and kicked after she demanded his warrant card.The sergeant produced his warrant card and said he wanted to ask some questions.They saw red when he got away with the offence by waving his warrant card at a traffic warden.
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