Commissioner of Police of the Metropolis v DSD & Anor , United Kingdom Supreme Court, Judgment, Law, casemine.com

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Commissioner of Police of the Metropolis v. DSD & Anor (Rev 1)

Smart Summary

Factual and Procedural Background

Between 2003 and 2008, a London taxi driver (“Individual A”) committed numerous sexual offences. Two victims, anonymised throughout the litigation as “DSD” and “NBV” (together, “Appellees”), were attacked in 2003 and 2007 respectively. They sued the Commissioner of the Metropolitan Police Service (“Appellant”) alleging that serious investigative failings by police officers violated their rights under Article 3 of the European Convention on Human Rights (ECHR), actionable through the Human Rights Act 1998.

At first instance, Judge Green held the Appellant liable and awarded damages. The Court of Appeal upheld that decision. The Supreme Court (constituted by Judge Kerr, Judge Neuberger, Judge Hale, and Judge Hughes) heard a further appeal. The Secretary of State for the Home Department (“Intervener”) and several non-governmental organisations intervened. The Appellant accepted that the assaults occurred and that serious investigative errors had been made, but disputed the existence and scope of any compensable, victim-specific investigative duty under Article 3.

Legal Issues Presented

Whether the investigative obligation under Article 3 is owed to individual victims or only to the public at large.
Whether the obligation is systemic (requiring adequate structures) or operational (requiring competent performance in individual cases).
Whether the duty arises only if State agents are complicit in the ill-treatment.
Whether breach of the duty gives rise to a right to damages under the Human Rights Act 1998.
Whether victims’ access to other sources of compensation (e.g., Criminal Injuries Compensation Authority) affects the availability of HRA damages.
Whether the absence of a common-law duty of care on the police should influence the scope of Article 3 obligations.
Whether domestic courts should await clearer Grand Chamber authority before recognising a positive, victim-specific investigative duty.

Arguments of the Parties

Appellant's Arguments

The police owe a communal, public duty to investigate crime; no private law or Convention duty is owed to individual victims.
Article 3 requires only adequate investigative structures; it does not mandate scrutiny of operational decisions unless State agents perpetrated the ill-treatment.
Public-policy reasons that negate a common-law duty of care (resource allocation, defensive policing) should equally negate a victim-specific Convention duty.
Any enforcement should occur through disciplinary bodies, not civil damages.
A departure from existing Strasbourg authority should occur, if at all, in Strasbourg, not domestically (R (Ullah) principle).

Appellees' Arguments

Article 3 imposes a positive, individual right to an effective investigation into serious violent crime, regardless of State complicity.
Both systemic and operational failings can breach that right; here, multiple operational errors were egregious.
Parliament, by enacting the Human Rights Act 1998, intended to provide domestic remedies; justiciability concerns are therefore misplaced.
Public-policy concerns that limit tort liability do not translate to Convention liability, whose purpose is vindicatory, not compensatory.
Strasbourg jurisprudence shows a “clear and constant” line recognising an operational investigative duty.

Intervener's Arguments (Secretary of State)

The investigative duty recognised in Assenov v Bulgaria is confined to cases of alleged abuse by State agents; the Court should not extend it without Grand Chamber authority.
Positive obligations must be interpreted to avoid imposing an “impossible or disproportionate burden” on policing (Osman v UK).

Table of Precedents Cited

Precedent	Rule or Principle Cited For	Application by the Court
Assenov v Bulgaria	Origin of the State’s duty to conduct an official investigation where State agents are suspected	Appellant relied on it to confine the duty to State-agent cases; Court distinguished its scope
MC v Bulgaria	Article 3 entails both systemic and operational duties to investigate serious violence	Court treated it as key authority for an individual, operational investigative duty
Calvelli and Ciglio v Italy	Positive obligations may be satisfied by effective civil remedies	Cited in debate over whether criminal investigation failures alone breach Article 3
Osman v United Kingdom	Positive duty to protect against real and immediate risks; obligations must not impose disproportionate burdens	Used to illustrate limits on positive obligations and resource considerations
Gäfgen v Germany	Grand Chamber affirmation of investigative duty in State-agent torture context	Appellant relied on it to argue for State-agent limitation
El-Masri v FYR Macedonia	Procedural limb of Article 3 in State rendition context	Same purpose as Gäfgen; Court found distinction not decisive here
Van Colle / Smith v Chief Constables	Difference between Convention claims and common-law negligence; existence of operational duty under Articles 2/3	Cited to show Convention aims differ from tort and to support operational duty
Beganović v Croatia	Positive obligation to investigate private-party violence	Relied on to confirm that State complicity is not required
Secic v Croatia	Requirements of prompt, diligent investigation into racially-motivated assault	Illustrated operational failings that can breach Article 3
CAS v Romania	Obligation to investigate sexual abuse by private individuals	Supported Appellees’ position on operational duty
O’Keeffe v Ireland	Grand Chamber endorsement of CAS principles	Cited as confirmation of “clear and constant” Strasbourg line
R (Ullah) v Special Adjudicator	Domestic courts should keep pace, but not outpace, clear Strasbourg jurisprudence	Appellant relied on it; majority held jurisprudence already clear
Hill v Chief Constable of West Yorkshire	No common-law duty of care owed by police in investigative context	Discussed to show why tort principles do not control Article 3 analysis
Michael v Chief Constable of South Wales	Re-affirmation of Hill; distinction between tort and human-rights duties	Used to illustrate divergence between common law and Convention law
Mustafa Tun v Turkey	Serious or decisive shortcomings test for investigative effectiveness	Quoted in assessing threshold for Article 3 breach

Court's Reasoning and Analysis

Judge Kerr (majority) held that Article 3 contains a positive, operational obligation owed to individual victims of serious violence, regardless of State complicity. The majority reasoned that:

Strasbourg authority since MC v Bulgaria shows a “clear and constant” line recognising such a duty.
The duty is breached by conspicuous and substantial investigative failings; minor errors do not suffice.
Satisfying structural requirements alone cannot absolve egregious operational shortcomings—e.g., failure to collect CCTV, delayed witness interviews, and repeated missed opportunities to link similar offences.
Public-policy objections (resource diversion, defensive policing) underpin the absence of a common-law duty but do not curtail Convention obligations, whose aim is rights-vindication.
Domestic courts need not defer to Strasbourg where jurisprudence is already clear; nor should they decline to protect Convention rights pending further Grand Chamber guidance.

Judge Hughes (dissenting on scope, but concurring in result) would have confined the duty to systemic failings, warning that routine scrutiny of operational decisions risks inhibiting effective policing.

Holding and Implications

APPEAL DISMISSED.

The Supreme Court confirmed that the police owe individual victims an Article 3 operational duty to conduct effective investigations into serious violent crime, and that significant investigative failures can attract damages under the Human Rights Act 1998. The immediate effect is to uphold the compensation awarded to the Appellees. More broadly, the decision clarifies that egregious investigative errors—distinct from mere isolated mistakes—may expose UK police forces to liability, thereby reinforcing standards for handling grave offences. The Court’s ruling does not create a common-law duty of care and emphasises that only serious investigative shortcomings will cross the Article 3 threshold.