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⚖️ The Cheshire West Judgment and the Acid Test

On 24th March 2014, the UK Supreme Court issued a landmark ruling in the Cheshire West case, which significantly broadened the legal definition of a deprivation of liberty under the Mental Capacity Act 2005.

This ruling impacts all care providers in England and Wales—especially care homes, hospitals, and other health and social care environments.

🔍 What Did the Ruling Establish?

The judgment clarified that a person who lacks capacity to make decisions about their care can only be lawfully deprived of their liberty if authorised by:

  • The Court of Protection, or
  • The Deprivation of Liberty Safeguards (DoLS) process.

🧪 The “Acid Test”

The ruling introduced a simplified legal standard—known as the acid test—which consists of two questions:

  1. Is the person under continuous supervision and control?
  2. Is the person free to leave?

If the answer to both is “yes”, then it is considered a deprivation of liberty—regardless of how “normal” or caring the setting appears.

✅ Key Clarifications from Lady Hale’s Judgment

  • It does not matter whether the person is content or compliant.
  • The environment’s “normality” is irrelevant.
  • The purpose or reason behind care arrangements does not change the legal status of deprivation.

📌 Indicators of Deprivation of Liberty

  • Restrictions on who the person can see or contact
  • Limits on activities or movement
  • Need for permission or supervision to leave the premises
  • Not being allowed to move to another location permanently

🏥 Widespread Impact

With an estimated 200,000 people living with dementia in care homes across England and Wales (Alzheimer’s Society), a significant number are likely to meet the acid test conditions. This means many care providers must now ensure proper DoLS authorisations are in place.

⚠️ Provider Responsibility

If a person lacks capacity and is not free to leave or is under constant supervision, a DoLS application must be made to comply with the law and safeguard their rights.