A bench warrant is issued by a judge when a person with a pending criminal case violates the rules of the court. Sometimes a warrant is issued for violating pre-trial release conditions. Most often, people with bench warrants simply have failed to show up for a scheduled court appearance. Once a bench warrant is issued, the police can treat it like any other warrant and use it to arrest people and keep them in jail, until the appear back in front of a judge. If you have a bench warrant, you need to contact your attorney as soon as possible.