Definition
Interrogation is the questioning of a person — typically a suspect, witness, or detainee — by law enforcement, a court, or another authority seeking to elicit information or a confession. In modern legal usage, the term carries particular constitutional weight in criminal procedure, where it triggers significant protections under the Fifth and Sixth Amendments.
Two distinct contexts govern how the term operates:
1. Criminal procedure (custodial interrogation): Questioning of a suspect by law enforcement while in custody. This is the dominant modern legal meaning. Once a suspect is in custody and subject to interrogation, Miranda warnings must be administered before questioning begins. The Supreme Court's definition of interrogation in this context extends beyond express questioning to include any words or actions by police that officers should know are reasonably likely to elicit an incriminating response — the standard established in Rhode Island v. Innis (1980).
2. Judicial and evidentiary interrogation: In older and civil-law usage, interrogation referred to formal questioning during legal proceedings — the examination of witnesses, parties, or deponents. This meaning survives in civil discovery through interrogatories (written questions submitted to a party) and in the historical practice of judicial examination of witnesses before trial.
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Common Language
Modern common usage (Wiktionary): The act of interrogating or questioning; an examination by questions; an inquiry. Also: a question put; a question mark.
Historical common usage (Webster's 1913): The act of interrogating or questioning; examination by questions; inquiry. Also a question put, or the punctuation mark indicating a question (the interrogation point).
The gap between common and legal meaning is real but subtle. In ordinary English, interrogation is simply sustained questioning with some implication of pressure or formality. In law, custodial interrogation is a term of art carrying constitutional consequences — it is not merely questioning, but questioning under conditions (custody plus official pressure) that activate Fifth Amendment protections. A casual conversation between a suspect and an officer on the street, even if probing, may not constitute interrogation in the legal sense. Researchers should not assume the common meaning controls in constitutional analysis.
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Common Confusion
Interrogation is sometimes used interchangeably with interview or examination, but these terms carry different legal loads. An interview typically implies a non-custodial, voluntary exchange. An examination (in the evidentiary sense) refers to structured questioning of a witness under oath at trial or deposition. Interrogation in the constitutional sense requires both custody and questioning (or its functional equivalent) — neither element alone suffices to trigger Miranda protections.
Interrogatories (written discovery questions in civil litigation) share the same Latin root but are a distinct procedural mechanism. Do not conflate interrogatories with custodial interrogation.
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Why It Matters in Research
The term interrogation operates differently depending on whether you are reading a source from before or after Miranda v. Arizona (1966). Pre-Miranda sources — including most historical legal dictionaries — use interrogation in the older evidentiary and judicial sense: formal questioning of witnesses, often in civil-law or ecclesiastical proceedings. The constitutional custodial interrogation doctrine is entirely a post-1966 development. Researchers reading 19th-century treatises, early Black's editions, or civil-law sources should not import modern Fifth Amendment associations into those texts.
The functional equivalence doctrine matters for corpus research. After Rhode Island v. Innis (1980), interrogation includes not just direct questions but police conduct designed to elicit incriminating responses. Legal materials analyzing police tactics — staged confrontations, psychological pressure, strategic deployment of evidence — may constitute interrogation analysis even when the word itself does not appear. Researchers following the Miranda line through secondary sources need to track this expansive definition.
Jurisdictional variation in state constitutional law also matters. Some state courts define interrogation more broadly than the federal floor set by Innis, extending protections to situations where federal doctrine would find no interrogation. Research confined to federal sources may miss protective state-law developments.
Sixth Amendment interrogation (post-indictment questioning of a represented defendant) is analytically separate from Fifth Amendment custodial interrogation. The two doctrines share vocabulary but have different triggers, different waiver rules, and different remedy structures. Sources discussing interrogation in the Sixth Amendment context (deliberately eliciting incriminating statements) are not interchangeable with Miranda-based Fifth Amendment sources.
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Historical Dictionary Support
Black's Law Dictionary entry on interrogation is notably thin, reflecting the term's older, narrower usage: Black's cross-references interrogation to the concept of a leading question, citing Bentham's Judicial Evidence, and notes the term's use in French law for formal judicial questioning. This is the civil-law and evidentiary sense — the examination of witnesses by a court or examiner — not the modern custodial interrogation doctrine, which postdates all historical editions of Black's that would be on a researcher's shelf.
The Webster's 1913 and Wiktionary entries confirm that the common meaning (sustained questioning, sometimes with the interrogation point — the question mark) is the baseline from which legal usage developed. The constitutional elaboration of the term is entirely a 20th-century construction, invisible to historical dictionary sources.
Historical sources are therefore most useful for understanding the evidentiary and procedural sense of interrogation in civil, ecclesiastical, and early criminal proceedings — the examination of witnesses before magistrates, the use of written interrogatories in equity, and the formal inquisitorial questioning practices that common-law courts largely rejected. For the modern constitutional doctrine, historical dictionaries offer nothing; the researcher must go directly to case law and post-1966 secondary sources.
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Jurisdictional Note
The federal constitutional floor for custodial interrogation is set by Miranda and Rhode Island v. Innis, but state constitutions may provide broader protections. Some states define custody or interrogation more expansively, requiring Miranda warnings in situations where federal doctrine would not. Research involving state criminal procedure should not assume federal definitions control.
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Encyclopedia Cross-Reference
Criminal Law Encyclopedia — Miranda: Interrogation Definition (Rhode Island v. Innis)
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