Jefferson City Police Capt. Deric Heislen said officers are still investigating the circumstances of Gray's disappearance.
Missouri State Highway Patrol helicopter aided in search efforts Thursday.
He said police haven't put out an AMBER Alert because in order to do so, police need to have a reasonable belief that a child has been abducted and that the child is in imminent danger of serious physical harm or death. Heislen said the absence of any one of these criteria means police must classify it as an endangered person advisory.
Missouri still can't get the Amber Alert down right. Even after Hailey Owens was literally raped and murdered during the time it took to get the proper "criteria" to issue an Amber Alert.
JMO