H418/03 - Article 5: liberty and security
Article 5 protects physical liberty while permitting specified forms of lawful detention. Learn to distinguish a deprivation from a restriction, test the legal ground and safeguards, and evaluate the tension between liberty and public protection.
Deprivation of liberty
Article 5 protects the liberty and security of the person against arbitrary deprivation of physical freedom. “Security” here accompanies protection of personal liberty; it is not a general guarantee that nothing dangerous will ever happen. A deprivation of liberty is sufficiently intense confinement. A restriction on movement is less intense and does not necessarily engage Article 5. The label used by an official cannot decide the issue.
In Guzzardi v Italy (1980), a suspected offender was confined to a small part of an island, subjected to close supervision and substantial restrictions on contact and movement. Strasbourg assessed the measures together and found a deprivation of liberty. The distinction depends on degree and intensity, considering the type, duration, effects and manner of implementation in the person's concrete circumstances. Detention need not involve a conventional prison cell.
Original application: a person voluntarily remains in a public building during a twenty-minute security check and can leave by another exit. Compare someone locked in one guarded room overnight, expressly forbidden to leave. The second case much more clearly deprives physical liberty; duration, confinement and coercion support that conclusion. In a borderline case, identify missing facts such as whether the person can actually leave and what happens if they try. Duration alone is not a complete test.
Care arrangements also need careful assessment, including confinement, valid consent and state responsibility. Cheshire West (2014) formerly used an “acid test” of continuous supervision and control and lack of freedom to leave. In a later development on 2 June 2026, the Supreme Court in the Attorney General for Northern Ireland's reference, [2026] UKSC 16, departed from that approach. It held that the acid test is not sufficient by itself and reaffirmed a multifactorial assessment; mere acquiescence does not establish valid consent. The 2026 change is recent additional context, rather than assumed knowledge for the baseline Summer 2027 tasks here. Do not treat the former acid test as today's complete rule.
Permitted grounds of detention
Article 5 is a limited right: paragraph 1 provides an exhaustive list of permitted grounds, all requiring lawfulness and a procedure prescribed by law. A government cannot add a seventh ground simply by claiming a useful public purpose. Compliance with domestic law is necessary but does not by itself remove the Convention's protection against arbitrariness.
| Article 5(1) ground | What it permits and a boundary |
|---|---|
| (a) Conviction | Lawful detention after conviction by a competent court; an official's allegation is not a conviction |
| (b) Court order or legal obligation | Lawful arrest or detention for non-compliance with a lawful court order, or to secure fulfilment of an obligation prescribed by law; it cannot become arbitrary punishment for general disobedience |
| (c) Criminal process | Lawful arrest or detention to bring the person before competent legal authority on reasonable suspicion of an offence, or when reasonably necessary to prevent an offence or flight after it; this is not an unrestricted preventive-detention power |
| (d) Minors | Detention by lawful order for educational supervision, or lawful detention to bring a minor before competent legal authority; age alone is insufficient |
| (e) Specified health and social grounds | Lawful detention to prevent spreading infectious disease, or of people falling within the Convention's categories concerning mental disorder, alcohol or drug dependence and vagrancy; a label or stereotype is insufficient and the relevant legal criteria and safeguards remain essential |
| (f) Immigration | Lawful arrest or detention to prevent unauthorised entry, or of a person against whom action is being taken towards deportation or extradition; nationality alone supplies no general detention ground |
The treaty uses historical terms including “persons of unsound mind”; modern discussion uses respectful language such as people with a mental disorder. The existence of a diagnosis does not make every confinement lawful. The legal basis, its conditions, necessity where required and review safeguards need examination.
Reasonable suspicion requires an objective factual basis for suspecting involvement in an offence; it does not require proof sufficient for conviction. An eyewitness account connecting a person with a theft can support suspicion. Arresting everyone who belongs to the same unpopular club without individual evidence is different. Keep this threshold separate from the prosecution's trial burden of proving guilt.
Original counterexample: a mayor orders someone detained because their lawful criticism harms the town's reputation. No listed ground follows from that purpose. Even if detention would silence the criticism effectively, a proportionality slogan cannot create a missing Article 5 ground.
Police powers and limits
Domestic arrest powers must meet their own conditions as well as Article 5. For ordinary police arrest without warrant in England and Wales, Police and Criminal Evidence Act 1984 section 24, or PACE, requires an applicable offence basis and reasonable grounds for believing arrest necessary for a listed reason. Examples include preventing injury, establishing an otherwise unascertainable name or address, or allowing prompt and effective investigation. Suspicion of an offence alone does not dispense with the statutory necessity requirement.
For example, an officer sees an assault, reasonably suspects Lee and knows that he is threatening a further attack. Arrest to prevent injury has a clear necessity basis. Change the facts: Lee's identity and address are established, he presents no danger and agrees to attend a properly arranged voluntary interview. Arrest may still sometimes be justified for investigation, but the officer must explain why it is needed on these facts instead of assuming necessity.
PACE section 41 normally limits detention without charge to 24 hours from the statutory relevant time. In the ordinary arrest-and-arrival situation, that is arrival at the first police station after arrest; special situations have their own rules. Section 42 allows a superintendent or higher officer to authorise up to 36 hours where the statutory conditions are met: an indictable offence, detention necessary to secure or preserve evidence or obtain it by questioning, and diligent, expeditious investigation. Reasons and an opportunity for representations matter.
Under sections 43 and 44, a magistrates' court can authorise further detention and extensions subject to the statutory tests, with an overall ceiling of 96 hours from the relevant time. These figures concern the ordinary PACE framework, not every special detention power. A ceiling is a limit, not permission to hold everyone until it expires; continued detention still needs justification.
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