Most cases begin with a warrant request. This is generally the first time that the Prosecuting Attorney's office is involved in a case, unless a prosecutor reviewed a search warrant or visited the crime scene. At this stage, the Prosecutor determines whether a person should be charged with a crime and, if so, what the crime should be. The Prosecutor must thoroughly review all reports and records concerning the case, including witness statements. The Prosecutor also reviews the suspect's prior criminal or traffic record. Occasionally, the reviewing Prosecutor sends the case back to the police to conduct additional investigation.