委任证是识别和警察进行权威的证明。该证通常只在英国和在现任和前任英联邦国家使用。许多其他国家参照同等的委任证只是作为警察的凭据身份证。

委任证一般包括照片持有人，以及持有人的姓名，职级，保证数量和全息会徽纪念真实性。认股权证数目相等于在其他警察服务徽章数量，它不像一个领号（有时会显示在制服）部门之间的转移或改变级别时，它可能会改变一个唯一的标识符。手令卡有时会显示旁边徽章来​​显示该人员所属的服务，但越来越普遍显示在一个身份证，同力冠印上。

在委任证的语言通常表明持有人授予权力由一个特定的官员来运行所担任的职位的职能，也可以为员工提供培训，以一个特定的水平。法定携带枪支英国警方人员可能对他们的委任证的认可这点。

A warrant card is proof of identification and authority carried by police officers and some other law enforcement officers including Immigration Officers. 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.