The AI Legal Privilege, And Professional Risk

UK v Secretary of State for the Home Department [2026] UKUT 00081 (IAC),

The decision in UK v Secretary of State for the Home Department represents an important judicial intervention into the use of artificial intelligence (“AI”) in legal practice, highlighting the risks such tools pose to core professional duties, particularly client confidentiality and legal professional privilege. Although arising in an immigration context, the Tribunal’s observations are of general application across all areas of legal practice.

The Tribunal clearly recognised the limitations of generative AI, particularly freely available, non-specialist tools, which may produce superficially persuasive but entirely inaccurate outputs, including fabricated authorities and incorrect citations. Such “hallucinations” are not treated as novel or excusable errors but as foreseeable risks which legal professionals are under a positive duty to guard against. Lawyers remain under an absolute obligation to ensure that all authorities cited are accurate, verifiable, and properly support the propositions advanced, irrespective of whether AI has been used.

Importantly, the decision makes clear that the use of AI does not dilute or displace traditional principles of professional responsibility. Even where work is delegated to junior fee-earners or produced with the assistance of technological tools, the supervising solicitor retains full responsibility for its accuracy. The Tribunal went so far as to state that a failure to supervise and verify work which contains AI-generated errors may render the supervising lawyer more culpable than the individual who initially introduced those errors. In that sense, the case underscores the continuing relevance of established principles of supervision and accountability, whilst adapting them to the realities of modern legal practice.

Most notably, the judgment provides unequivocal guidance on confidentiality and privilege. The Tribunal stated that uploading client documents or correspondence into open-source AI tools (such as free versions of Chat GPT) may place such material in the public domain, thereby breaching confidentiality and thus waiving legal professional privilege. Given that privilege is contingent upon confidentiality, any such loss is potentially irreversible, regardless of the practitioner’s intention.

The Tribunal further situated this risk within the broader regulatory and data protection framework, noting that such conduct may give rise to reporting obligations to professional regulators and the Information Commissioner’s Office. However, it drew an important distinction between open-source AI tools and secure, closed enterprise systems, indicating that the latter may be used more safely where appropriate safeguards are in place.

In conclusion, UK v Secretary of State for the Home Department stands as a landmark decision in the emerging jurisprudence on AI in legal practice. Its importance lies in its clear articulation of a principle which will undoubtedly shape future conduct, whilst ensuring the preservation of legal privilege remains paramount, and any use of technology which jeopardises that protection will undoubtedly offer consequences. The case therefore serves as both a warning and a guide, reminding practitioners that whilst the tools of legal practice may evolve, the core duties which underpin it remain unchanged.