Definition
Unlawfully detaining refers to the act of holding, confining, or keeping a person or property in a place or status without legal justification. The phrase appears in two distinct legal contexts, each with its own doctrinal framework:
1. Criminal/tort context (detention of persons): Holding a person against their will without legal authority. This overlaps substantially with false imprisonment and, in more aggravated forms, kidnapping. At common law, particular attention attached to the unlawful detention of women, where statutes required proof that the detention was against the victim's will and committed for a specific criminal purpose (historically, carnal knowledge).
2. Property/landlord-tenant context (unlawful detainer): Wrongfully holding possession of real property after the right to possess has expired or been terminated. This is the more common modern legal usage of the phrase's root concept. A tenant who remains on the premises after a lease termination, eviction notice, or judgment for possession is said to be unlawfully detaining the property from the landlord.
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Common Language
Modern common usage (Wiktionary): To detain means to keep someone from proceeding or to hold them in custody; "unlawfully" simply modifies this to mean doing so without legal right.
Historical common usage (Webster's 1913): Detain — to hold or keep in custody; to restrain from proceeding; to keep back or withhold.
The common meaning tracks the ordinary sense of "holding back." The legal gap is one of precision and consequence: in law, "unlawfully detaining" is a term of art that triggers specific procedural remedies (summary eviction proceedings, criminal charges, tort liability) and requires satisfaction of defined legal elements — not merely any wrongful act of withholding or holding.
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Common Confusion
Unlawfully detaining (a person) is frequently conflated with false imprisonment and, at the more serious end, kidnapping. The distinction matters: false imprisonment is typically a tort, kidnapping is a felony, and statutes governing unlawful detention of persons may carry intermediate criminal penalties with specific intent requirements. In the property context, "unlawful detainer" is sometimes used interchangeably with "forcible detainer" or "holdover tenancy," but these are not identical — forcible detainer implies force or threats in retaining possession, while unlawful detainer may arise simply from a tenant's passive refusal to vacate. Researchers conflating the two may miss the correct procedural remedy or the applicable evidentiary standard.
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Why It Matters in Research
The phrase "unlawfully detaining" is a trap for researchers because it operates in at least two essentially unrelated bodies of law — criminal/tort law governing personal liberty, and landlord-tenant property law — using identical or near-identical language. Failing to identify which context applies will lead a researcher into the wrong doctrine entirely.
In the criminal/sexual offense context: Older statutes and cases, including the Bouvier entry, defined unlawful detention of a woman in terms specifically tied to carnal knowledge. This historical framing has largely been superseded by modern sexual assault and kidnapping statutes that do not require proof of intended carnal knowledge. Researchers using historical Kentucky reporters or similar 19th and early 20th century sources should treat these cases as period-specific and not assume they reflect current law.
In the landlord-tenant context: Unlawful detainer actions are summary proceedings — they move faster than ordinary civil litigation, the defenses available to the tenant are limited, and counterclaims may be restricted or prohibited. Researchers working with historical property law sources should note that the procedural mechanics of unlawful detainer have changed substantially by statute across jurisdictions. The common law background may not reflect current practice at all.
In the immigration context: "Detainer" takes on yet another meaning — an ICE detainer is a federal request to a local jail or law enforcement agency to hold a person beyond their scheduled release date. This usage is distinct from both the criminal and property law contexts. Constitutional challenges under the Fourth Amendment have intensified in recent years, and the legal authority underlying ICE detainers remains actively litigated.
Corpus researchers should anchor their search to the specific context — property, criminal, or immigration — before treating cases or treatise passages on "unlawfully detaining" as applicable across domains.
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Historical Dictionary Support
Bouvier's Law Dictionary provides only a single, narrow entry for "unlawfully detaining" in the criminal/personal detention context: the offense requires that the detention be against the woman's will and for the purpose of carnally knowing her, citing a Kentucky appellate decision. This entry reflects the late 19th and early 20th century pattern of treating women as a specific subject class in criminal detention statutes — a framing that does not survive into modern law.
Bouvier offers no treatment of unlawful detainer in the property context under this specific phrase, though the concept of unlawful detainer as a landlord-tenant remedy has deep common law roots and appears extensively in contemporaneous treatises on real property and landlord-tenant law. The absence in Bouvier under this heading is itself a research signal: the property law usage was handled under its own entry ("Unlawful Detainer") as a distinct term of art, not as a modifier phrase.
The gap Bouvier leaves is substantial: it captures only one strand of a multi-stranded term, and that strand is the one most thoroughly displaced by subsequent statutory development.
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Jurisdictional Note
Unlawful detainer as a property remedy is governed almost entirely by state statute, and the procedural rules — notice periods, available defenses, whether counterclaims are permitted, and the speed of proceedings — vary considerably across jurisdictions. Researchers should not assume that a rule derived from one state's unlawful detainer statute reflects the law in another.
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Encyclopedia Cross-Reference
Landlord-Tenant — Eviction — Summary Proceedings and Unlawful Detainer (The Law Mind Property Law Encyclopedia): Primary reference for the property law context, procedural mechanics, and tenant defenses.
ICE Detainers — Legal Authority, Fourth Amendment Challenges, and Judicial Warrants (The Law Mind Immigration Law Encyclopedia): Essential for the immigration context, where "detainer" carries a distinct and constitutionally contested meaning.
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