What is one of the duties of a police officer when arresting someone on a warrant?

Having a copy of the warrant when arresting someone is crucial for several reasons. First, it ensures that the officer is acting within the legal framework and has the appropriate authority to make the arrest. The warrant provides details about the charges against the individual and authorizes the law enforcement officer to take them into custody. This transparency is essential not only for the arresting officer's protection but also to uphold the rights of the suspect, as it allows the officer to show the individual the legal grounds for their arrest.

Additionally, presenting a warrant can help de-escalate potentially tense situations. It reinforces the legitimacy of the officer's actions and offers the arrested individual clarity regarding the reasons for their arrest. While officers may still pursue an arrest in some circumstances without a physical copy of the warrant—for example, if they can easily verify its existence—the best practice is to have it readily available to ensure compliance with legal protocols and to facilitate smooth processing of the arrest. Hence, having a copy of the warrant if practicable is a fundamental duty of a police officer when executing an arrest on a warrant.