Ontario: New Rules Mandate Factum Certification for AI Accountability

• Canadian legal professionals are rapidly adopting AI, with 95% of those surveyed by Clio using the technology.
• Ontario's updated factum certification rules, effective December 2024 and September 2026, require lawyers to certify the authenticity of citations and accuracy of quotations.
• A study found 86 Canadian decisions flagged fictitious citations in 2025, with AI presumed involved in 96 cases between January 2024 and March 2026.
• Lawyers remain fully accountable for AI-assisted work, as professional duties of competence, confidentiality, supervision, and quality of service are not transferable to software.
• Many Canadian law firms face a "compliance gap," using generic AI tools that lack built-in verification workflows, despite increasing regulatory scrutiny.

Canadian lawyers retain full accountability for all work produced with AI assistance; this responsibility does not transfer to the software or its vendor.

The legal profession in Canada is rapidly integrating artificial intelligence into daily operations, a trend highlighted by the Canadian Lawyer's Readers' Choice Awards 2026, which recognized 78 organizations with 117 awards for their contributions to legal technology. This year's awards notably introduced new categories for legal AI providers, reflecting the technology's growing prominence. A recent report, "Legal Trends for Canadian Law Firms," released by Clio on March 16, 2026, underscored this shift, revealing that 95 percent of the 597 Canadian legal professionals surveyed are already utilizing AI in their work.

Despite the swift adoption of AI, the fundamental professional obligations of lawyers remain constant. However, the mechanisms for judicial oversight and verification have evolved significantly. This rapid integration of AI into legal workflows has created new challenges, particularly concerning the accuracy and authenticity of AI-generated content, prompting courts and regulatory bodies to implement more stringent checks.

In response to the increasing use of AI in legal submissions, Ontario has updated its factum certification rules to ensure greater accountability. Effective December 1, 2024, subrule 4.06.1(2.1) of the Ontario Rules of Civil Procedure mandates that any individual signing a factum in a civil proceeding must certify the authenticity of every cited authority. Further strengthening these requirements, a subsequent amendment, effective September 1, 2026, demands certification that all quotations from an authority precisely reproduce the original text.

These regulatory changes come amidst a documented rise in fictitious legal citations. A study conducted by Tom Macintosh Zheng, co-founder of Toronto-based Courtready.ca, published by the Canadian Legal Information Institute (CanLII) and referenced by the Law Society Tribunal, revealed a significant increase in such instances. The study identified 86 Canadian decisions flagging fabricated citations in 2025, a sharp rise from just seven in 2024. Out of 132 decisions reviewed between January 1, 2024, and March 26, 2026, courts and tribunals either identified or presumed AI involvement in 96 cases. While most of these involved self-represented litigants, 24 instances saw fabricated material submitted by parties with legal representation.

The introduction of AI tools does not absolve legal professionals of their core responsibilities. Yola Ventresca, a managing partner at Lerners LLP in London, Ontario, and a certified workplace investigator, emphasizes that Canadian lawyers retain full accountability for all work produced with AI assistance; this responsibility does not transfer to the software or its vendor. Ventresca, who also founded her firm's Workplace Investigations practice and is recognized as one of Canadian Lawyer's Top 25 Most Influential Lawyers, anticipates that client expectations will increasingly drive the pace of AI adoption within firms.

Ventresca highlights the growing pressure on traditional billing models and advises firm leaders against treating AI as a secondary innovation project. She asserts that fundamental professional obligations, including duties of competence, confidentiality, supervision, and quality of service, remain unchanged. While AI may transform how legal work is executed, it does not shift these critical responsibilities away from the lawyer.

Despite the clear professional duties and tightening regulatory environment, the adoption of AI is outpacing the development of robust verification practices within Canadian law firms. Clio's "Legal Trends for Canadian Law Firms" report identifies a "compliance gap," noting that 42 percent of small firms and 38 percent of larger firms utilize generic AI tools that lack integrated verification workflows. This contrasts with the more advanced adoption of legal-specific AI tools, such as those for contract review, by larger firms (26 percent) compared to small firms (6 percent).

The report also indicates a positive financial impact for firms embracing AI, with 71 percent of mid-sized and larger firms reporting revenue growth, compared to 47 percent of small firms. However, the widespread use of generic AI tools without built-in verification mechanisms presents a significant risk. This uneven adoption and reliance on unverified AI outputs underscore the critical need for firms to establish rigorous internal checks or invest in specialized legal AI solutions that incorporate verification to ensure compliance with evolving standards and mitigate professional liability risks.

Lawyers and compliance officers in Canada, particularly Ontario, must ensure rigorous verification of all AI-generated content, especially legal citations and quotations, to comply with updated factum certification rules and avoid professional liability for fictitious or inaccurate submissions. Firms should prioritize legal-specific AI tools with built-in verification or establish robust internal checks to bridge the 'compliance gap' identified by Clio.

Source: Original reporting via Canadian Lawyer's Readers' Choice Awards