Warrant card

A warrant card is proof of identification and authority carried by police officers and some other law enforcement officers including immigration officers and Approved Mental Health Professionals. The term is normally used only within the United Kingdom and in current and former Commonwealth countries. Many other countries refer to their equivalent of warrant cards simply as police credentials, commission books, or identification cards. In the UK MI5 officers also have warrant cards.^[1] Specially trained mental health practitioners called Approved Mental Health Professional are also warranted council officers and carry warrant cards when acting under the Mental Health Act 1983.^[2]

Warrant cards generally include a photograph of the holder as well as the holder's name, rank, warrant number and a holographic emblem to mark authenticity. The warrant number is equivalent to a badge number in other police services; it is a unique identifier unlike a collar number (sometimes displayed on the uniform) which may change when transferring between departments or changing rank. A warrant card is sometimes displayed alongside a badge showing the service to which the officer belongs, but is increasingly commonly displayed on one ID card, with the force coat of arms printed on it.

The text on a warrant card usually indicates that the holder is granted authority by a specific official to perform the functions of the office held, and may also indicate training to a particular level. In the UK, police personnel authorized to carry firearms may have an endorsement on their warrant card to that effect.