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Courses/Law/Trial Competence / Skills

How to Impeach a Witness

Master the art of discrediting witness testimony. Learn tactical approaches to expose inconsistencies, biases, and unreliable accounts, ensuring you control the narrative.

Created byToronto Lawyers Association
BeginnerUpdated Nov 22, 2025
How to Impeach a Witness

What You'll Learn

check_circleUnderstand the legal foundations for impeaching a witness.
check_circleIdentify the various methods and grounds for impeachment.
check_circleApply strategic and ethical considerations during cross-examination.
check_circleEnhance trial advocacy through practical examples and case law.

About This Course

This online session provides practical guidance on the effective impeachment of witnesses in litigation. Our expert counsel will explore the strategic use of prior inconsistent statements, bias, character evidence, and contradiction to challenge a witness's credibility. The session includes real case examples, discussion of evidentiary rules, and ethical considerations. Ideal for litigators, both criminal and civil, seeking to sharpen their courtroom advocacy and cross-examination techniques.

Key learning outcomes include:

  • Understanding the primary goal of impeachment: correcting adverse evidence or undermining witness credibility.
  • Mastering methods for setting up impeachment during preliminary proceedings, such as examinations for discovery and preliminary hearings, by extracting definitive answers.
  • Learning how to effectively present prior inconsistent statements using transcripts, documents, and even video evidence, with practical, step-by-step guidance.
  • Developing tactical awareness regarding when to seek witness adoption of prior statements versus when to focus solely on discrediting testimony.
  • Exploring specialized impeachment considerations for expert witnesses, including preparation, literature review, and strategic cross-examination approaches.
  • Gaining insight into the sensitive and fair impeachment of vulnerable or child witnesses.
  • Analyzing real-world examples of successful and challenging impeachments, emphasizing the critical role of precision in questioning and preparation.
  • Differentiating between material and minor inconsistencies, and when to pursue each strategically.

Mastering the art of impeachment is essential for persuasive advocacy—this session will give you the tools to do just that.

Your Instructors

Toronto Lawyers Association
Toronto Lawyers Association

Toronto Lawyers Association

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For more than 135 years, the Toronto Lawyers' Association, located within the Courthouse Library, has represented the interests of lawyers practising in the City of Toronto. The association was founded to support its members in three key areas: Knowledge, Advocacy, and Community. To uphold these pillars, the association offers a year-round mix of online and in-person education programs for lawyers, hosts both free and paid events to foster in-person networking, and submits advocacy pieces on behalf of its members to the Ontario bench and bar, all levels of government, and the broader public.

Todd  Weisberg
Todd Weisberg

Partner at Shields O'Donnell MacKillop LLP

Todd represents employers in all areas of employment and labour law, including wrongful dismissal litigation, employee discipline and termination, employment standards complaints, human rights complaints, labour arbitration, workplace safety litigation, fiduciary litigation, and drafting employment policies and contracts. He has represented clients before all levels of court in Ontario, including judicial reviews and appeals before the Divisional Court and the Ontario Court of Appeal. Todd frequently writes on topics related to employment law and has authored or co-authored articles for Canadian Lawyer In House Magazine, Workplace.ca, Your Workplace, LexisNexis Practice Advisor, and the Federated Press. Todd has a strong interest in entrepreneurship and has worked for a variety of small businesses, including previously running his own construction business. As a result of these experiences Todd understands the practical issues that come with managing a workforce. Todd enjoys Toronto’s vibrant restaurant scene, travelling, snowboarding, and cheering for the Leafs, Jays, Raptors and Bills.

Adam  Weisberg
Adam Weisberg

Lead Counsel at Weisberg Law Criminal Lawyers LLP

Mr. Weisberg is a graduate of the Queen’s University Faculty of Law and has been a criminal lawyer for over twenty years. He was selected through a peer reviewed process by Best Lawyers for Criminal Defence. Mr. Weisberg started his career at a national business law firm. He then practised with a highly regarded senior member of the criminal bar before becoming a partner at what was then Canada’s largest criminal law firm. In 2010, having his own vision for a criminal law firm, he started Weisberg Law Criminal Lawyers.

Junior  Sirivar
Junior Sirivar

Partner at Blake, Cassels & Graydon LLP

Junior Sirivar is a partner in the litigation group at Blake, Cassels & Graydon LLP, where he provides strategic legal counsel to domestic and international clients across a broad range of industries, including mining, financial services, and telecommunications. With extensive experience in complex commercial disputes, Junior is known for delivering insightful and effective legal strategies. A Fellow of the American College of Trial Lawyers, Junior is recognized as a leading arbitration counsel and litigator in several prestigious legal directories, including Chambers Global Guide to The World’s Leading Lawyers for Business, Chambers Canada, The Lexpert/American Lawyer Guide to the Leading 500 Lawyers in Canada, The Legal 500 Canada, The Canadian Legal Lexpert Directory, and Benchmark Canada: The Guide to Canada’s Leading Litigation Firms and Attorneys. In addition to his legal practice, Junior is a co-author of the Canadian Chapter in The Global Damages Review. His areas of specialization include investor-state arbitration, complex commercial disputes, mining litigation, securities litigation, class proceedings, professional negligence, and insurance cases.

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We are a registered provider with 327+ associations and regulatory bodies worldwide. We operate across 29 global markets including Canada, the US, Australia, and the UK. Every course page clearly displays its specific accreditations. Upon completion, you receive a professional certificate that can be validated online. Our certificates include all necessary accreditation details, credit hours, and completion dates, and are formatted specifically to meet the submission requirements of most global regulatory bodies.