when you are arrested in the U.S.A, police officers must warn you that you have the right to remain silent, that any thing you say could be used against you in a court of law, that you have the right to contact a lawyer and that if you cannot afford a lawyer, that one will be provided before any questioning if so desired. Failure to issue the Miranda warning renders evidence so obtained to not be admissible in the court. The warning became a national police requirement when ordered by the US Supreme Court in the 1966 case Miranda v. Arizona and that is how it got the name.It also known as the Miranda Rule or the Miranda Warning.