A major legal shift – effective immediately.
On 2 June 2026, the UK Supreme Court handed down a landmark judgment in A Reference by the Attorney General for Northern Ireland [2026] UKSC 16.
This decision overrules Cheshire West and Chester Council v P [2014] UKSC 19 and replaces the well-known ‘acid test’ with a new approach grounded more closely in European human rights law.
The judgment is expected to:
- Narrow the number of people considered deprived of their liberty.
- Reduce system pressures over time.
For practitioners across social care and health, the impact is immediate and significant, and there is no transition period:
- The Cheshire West ‘acid test’ no longer applies.
- Decisions will rely more on professional judgment and a contextual, multi‑factorial assessment.
- Policy and practice will need rapid adaptation.
Cheshire West introduced a simple ‘acid test’:
- continuous supervision and control, and
- not free to leave.
This wide definition brought large numbers of people within Article 5 safeguards (the right to liberty and security under the European Convention on Human Rights (ECHR)). Fundamentally reshaping practice and driving a significant increase in Deprivation of Liberty Safeguards (DoLS) applications and legal oversight across social care and health.
The Supreme Court has now held that the ‘acid test’ was not consistent with the approach required by Article 5 of the ECHR as interpreted by the European Court of Human Rights, and that it was too rigid.
The Court replaces the ‘acid test’ with a contextual, multi-factorial assessment centred on the person’s ‘concrete situation’.
The Court did not prescribe a fixed or exhaustive list of factors. Instead, drawing on the European Court of Human Rights’ focus on ‘the type, duration, effects and manner of implementation of the arrangements’ (e.g. Guzzardi v Italy (1980) 3 EHRR 333), it indicated that relevant considerations may include:
- the type and degree of restrictions
- duration and effects
- ability to leave
- social contact
- how arrangements are implemented.
These factors are illustrative rather than determinative and must be considered as part of an overall, fact-sensitive assessment. This represents a shift away from a fixed legal test towards a more holistic analysis of the person’s circumstances.
The Court reaffirmed that a deprivation of liberty involves three elements under Article 5 (right to liberty and security) of the ECHR:
- Objective – confinement in a restricted space.
- Subjective – absence of valid consent.
- State responsibility – where the state knew or ought reasonably to have known about the situation.
These elements must now be considered together, as part of an overall assessment of the persons circumstances.
One of the most important developments is the Court’s approach to consent. It confirms that:
- A person may lack capacity under the Mental Capacity Act 2005 (MCA).
- But still be capable of giving ‘valid consent’ for Article 5 purposes (in the sense of the absence of objection and coercion, rather than a formal MCA consent decision).
This is not a decision-specific MCA concept. Instead, it requires a holistic, context-specific assessment.
Relevant considerations may include:
- the presence or absence of objection
- the degree of coercion, constraint or control
- whether behaviour indicates genuine acceptance or resistance
- the person’s lived experience
- their wishes and feelings, verbal or non-verbal.
The court has been clear that no single factor is determinative. The focus must be whether apparent ‘consent’ reflects real acceptance, rather than compliance shaped by dependency or constraint.
This marks a clear departure from Cheshire West, where lack of capacity under the MCA meant an automatic inability to consent.
The Court places particular emphasis on:
- Objection or resistance – strong indicator of deprivation.
- Genuine acceptance – may point away from deprivation.
- Coercion or constraint – central to the analysis.
Taken together, these factors reinforce the need for careful, evidence-based judgment about how the person actually experiences their situation.
Implications for safeguarding, human rights and practice
A widely anticipated consequence is that fewer situations may be recognised as engaging Article 5 procedural safeguards.
This raises an important human rights tension. If fewer situations are recognised in law as a deprivation of liberty, this does not necessarily mean fewer restrictions in practice. It may mean fewer people benefit from independent scrutiny, advocacy and the possibility of legal challenge.
In practice, this may result in:
- Fewer cases subject to independent authorisation and review.
- Reduced access to advocacy and challenge mechanisms.
- Greater reliance on best interests decision-making.
At the same time, there is an increasing emphasis on applying human rights principles in everyday decision-making, particularly:
- Respect for autonomy and dignity (Article 8 of the ECHR).
- Ensuring restrictions are necessary and proportionate.
- Identifying and responding to coercion, control and constraint.
This places a heightened responsibility on practitioners. Without the automatic safeguards triggered by Article 5, there is greater reliance on professional judgement to ensure that restrictive arrangements are visible, justified and open to challenge.
The judgment reinforces the importance of not equating compliance or lack of objection with consent, especially where people may be highly dependent or unable to express dissent.
The Supreme Court has stressed that the assessment must be practical and realistic, and that where there is genuine or serious doubt as to the persons wishes or attitude, consent should not be inferred.
Critical perspectives
The judgment has generated significant debate, particularly from the disability rights organisations who jointly intervened in the case – Mind, Mencap and the National Autistic Society. In a joint response following the decision, these interveners described the ruling as:
the biggest rollback of disability rights in a generation.
They argue that overturning Cheshire West risks removing ‘fundamental human rights protections’ from large numbers of disabled people, particularly those in highly restrictive care settings.
At the same time, legal commentary presents a more supportive interpretation of the judgment, for example:
- Correction of an over‑expansive approach. One analysis notes that the Cheshire West ‘acid test’ ‘creates a bright-line test which is too crude in its application, and which leads to an over-extensive interpretation of deprivation of liberty.’ (Browne Jacobson, 3 June 2026).
- Closer alignment with European case law (Strasbourg Court of Human Rights). Legal commentary explains that the Supreme Court rejected the ‘acid test’ because it was not supported by European Court of Human Rights case law, restoring a more orthodox approach grounded in Strasbourg principles (Sintons legal overview, 2nd June 2026).
- A more contextual, multi‑factorial assessment. Commentary highlights that the Court has replaced the rigid test with an assessment based on the individual’s ‘concrete situation’, considering factors such as duration, degree of control, and lived experience, rather than automatic classification (Sintons legal overview, 2nd June 2026).
What this means for practice
Practitioners must navigate a more complex, less certain legal landscape, where the boundary of protection is less clear and more reliant on professional judgment - while continuing to uphold the fundamental right to liberty for people with care and support needs.
The removal of the ‘acid test’ means decision-making must now be more nuanced and evidence-based, with a focus on the person’s lived experience, wishes, feelings, any indication of objection, and the presence of coercion.
The judgment takes immediate effect, with no transitional period. The Cheshire West approach can no longer be relied upon, and existing guidance must be read in light of this change. This places a clear and immediate responsibility on practitioners to apply the new framework in their decision-making.
Decisions will need to be clearly evidenced and recorded, demonstrating how relevant factors have been considered and weighed in the context of the individual’s situation, rather than relying on a fixed threshold.
Practice will continue to evolve as organisational and legal guidance develops, and it is likely that formal national guidance will be published soon.
- Do not rely on the ‘acid test’ – it is no longer valid.
- Adopt a multi-factorial approach – consider the full lived experience of the person.
- Document wishes, feelings, and behaviours carefully – these are now central to the legal analysis.
- Focus on coercion and objection – ask: is the person being compelled, or are they accepting care?
- Seek legal and organisational guidance – practice frameworks will evolve rapidly.
Look out for:
- Research in Practice materials – to support this area of practice.
- National guidance – new or updated codes of practice.
- How confident are you in applying a multi-factorial legal test?
- How are you evidencing wishes, feelings, and consent in practice?
- Are you at risk of under-identifying deprivations of liberty?
Final reflection
This judgment fundamentally reshapes how deprivation of liberty is identified in law.
In this sense, it does not remove the need for safeguards – it arguably redistributes responsibility for them from formal legal frameworks into everyday practice.
This makes it vitally important for practitioners to place human rights at the centre of decision-making, ensuring that liberty, dignity and autonomy are actively recognised, carefully evidenced, and meaningfully upheld in every decision that restricts a person’s freedom.
Research in Practice is developing its approach to supporting the sector with this significant change in the law. We really welcome feedback – please get in touch to share your experiences and perspectives.
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