The Miranda warning (often abbreviated to "Miranda," or "Mirandizing" a suspect) is the name of the formal warning that is required to be given by police in the United States to criminal suspects. It must be given before they are interrogated, in accordance with the "Miranda" ruling. Its purpose is to ensure the accused are aware of these rights under the U.S. Constitution. Also so they know they know they can invoke them at any time during the interview.