An Arizona Warrant for the Arrest of a Witness in a Grand Jury Proceeding (Under Seal) is a judicial process whereby a person accused of a crime is arrested by law enforcement officers, based on a Grand Jury's determination of probable cause. This type of arrest warrant is issued by a court in Arizona when a witness has failed to appear in court as part of the Grand Jury's proceedings. The warrant is sealed, meaning that the details of the investigation are not available to the public. There are two types of Arizona Warrant for the Arrest of a Witness in a Grand Jury Proceeding (Under Seal): an On-View Warrant and a Subpoena-Based Warrant. An On-View Warrant is issued when a law enforcement officer has probable cause to believe a witness has committed a criminal offense. A Subpoena-Based Warrant is issued when a witness has failed to appear in court after being issued a subpoena. In both cases, the law enforcement officer must make a sworn statement under oath, detailing the facts and circumstances of the alleged criminal offense and the witness' failure to appear in court. The sworn statement must be provided to the court, along with any other evidence that supports the issuance of an arrest warrant. Once the court has determined that there is probable cause, the warrant will be issued. The warrant must be served upon the witness by a law enforcement officer and the witness must be taken into custody and brought before the court.