Interrogation refers to the formal questioning of a suspect, accused person, witness or other individual by police or other investigators, usually in connection with a criminal investigation. It covers structured, often recorded, interviews designed to obtain information, admissions or confessions, and is distinct from informal conversation or general enquiries.In England and Wales and Northern Ireland, interrogation is governed principally by police powers and safeguards under legislation such as the Police and Criminal Evidence Act 1984 (PACE) and equivalent codes, including rules on caution, legal advice, silence, oppression and admissibility of confessions. In Scotland, police “interviews” are regulated under the Criminal Justice (Scotland) Act 2016, with similar protections. In Ireland, interrogation is regulated under the Judges’ Rules, the Criminal Justice Acts and constitutional fair‑trial guarantees.Across all four jurisdictions, key legal issues include voluntariness of statements, the right to legal assistance, treatment of vulnerable suspects, recording requirements and exclusion of improperly obtained evidence. The term is descriptive rather than usually defined in statute, but is widely used in criminal practice, human rights law and litigation concerning the lawfulness and reliability of suspects’ statements.