An arrest warrant is a written order from a judge or magistrate that commands the police or other authority to physically take a person accused of a criminal offense into custody. The Fourth Amendment to the United States Constitution requires an arrest warrant to be supported by probable cause—which means there is a reasonable basis to believe the person to be arrested committed a crime.

Arrest warrants protect people from unlawful arrests by requiring the independent review of supporting facts by a person (judge or magistrate) who is not involved in the process of investigating the alleged crime. Arrest warrants also give the accused actual notice of the charge of a criminal offense committed by the accused. Arrest warrants are generally required to take an accused into physical custody unless there is an exception to the warrant requirement—such as when the crime is committed in the presence of the arresting officer.

In Alabama, as in all states, arrest warrants are legal documents issued by a judge or magistrate that authorize law enforcement to take an individual accused of a crime into custody. The requirement for an arrest warrant is grounded in the Fourth Amendment of the U.S. Constitution, which mandates that warrants be supported by probable cause. This means there must be a reasonable amount of trustworthy evidence to believe that the person named in the warrant has committed a crime. The process of obtaining an arrest warrant in Alabama involves law enforcement presenting an affidavit to a judge or magistrate, detailing the evidence that establishes probable cause. The issuance of an arrest warrant ensures that there is a neutral and detached review by a judicial officer, which serves as a safeguard against arbitrary arrests. While arrest warrants are a common requirement for taking someone into custody, Alabama law does recognize exceptions to this rule, such as when a crime is witnessed by a police officer, which may allow for an arrest without a warrant.