The obligation to inform an individual of their constitutional rights arises during a custodial interrogation. This means the individual is both in custody, meaning their freedom of movement is significantly restricted to a degree associated with a formal arrest, and is being subjected to interrogation, meaning direct questioning or its functional equivalent that is likely to elicit an incriminating response. If both elements are not present simultaneously, the requirement does not exist. For example, questioning a suspect at the scene of a crime who is free to leave does not necessitate the advisory, even if the questioning is intended to gather information potentially leading to charges.
The procedure protects individuals from self-incrimination under the Fifth Amendment. It stems from the landmark Supreme Court case Miranda v. Arizona (1966). Its implementation ensures that statements obtained during police questioning are admissible in court, confirming the individual understood their right to remain silent and their right to an attorney. This safeguards individuals, particularly those unfamiliar with the legal system, from unwittingly waiving their constitutional protections. Proper adherence strengthens the integrity of the justice system by promoting fair and ethical law enforcement practices.