Most people are familiar with the first lines of the Miranda warning, "you have the right to remain silent. Anything you say or do can and will be held against you in a court of law." However, not everyone is aware of the specific constitutional rights embodied in the warning.
The Miranda warning originates from the 1966 Supreme Court case Miranda v. Arizona. In Miranda, the United States Supreme Court held that it was a violation of a person's 5th Amendment right against self-incrimination to be interrogated while in police custody without being warned of the right not to speak.
If police fail to inform a suspect of their Miranda right to remain silent and interrogate him while in custody, any confession or incriminating information stemming from the interrogation will not be admissible in court.