An Arizona Warrant for the Arrest of a Witness or Material Witness in a Pending Criminal Case is an order from a judge issued to law enforcement to apprehend and take into custody a witness or material witness who is believed to have relevant information pertaining to a pending criminal case. This type of warrant is usually issued to compel a witness to appear in court and to provide testimony or evidence that is pertinent to a criminal case. There are two types of Arizona Warrant for the Arrest of a Witness or Material Witness in a Pending Criminal Case: a material witness warrant and an arrest warrant. A material witness warrant, also known as a John Doe warrant, is issued to a witness who is believed to possess material evidence that is necessary to the prosecution of a criminal case. This type of warrant is typically used when the identity of the witness is unknown and a description must be given to law enforcement in order for them to apprehend the witness. An arrest warrant is issued to a witness who is believed to have information pertinent to a criminal investigation. This type of warrant is usually issued when the identity of the witness is known and the witness has failed to appear in court or provide the necessary information or evidence requested by the court. Both types of Arizona Warrant for the Arrest of a Witness or Material Witness in a Pending Criminal Case are legally binding and must be followed in order for the witness to be taken into custody.