R. v. O'Connor: Involves an Application Seeking Disclosure of Information Possessed By a Third Party | Lo Greco Law


Last Updated: August 23 2026

Question:How does R. v. O'Connor affect when the defence can request disclosure of third-party records in an Ontario criminal case?

Answer:Lo Greco Law can help you understand the disclosure process for third-party records under the Supreme Court of Canada’s decision in R. v. O’Connor, [1995] 4 S.C.R. 411 by explaining how the defence must first apply to the court to show the records are likely relevant, then how the judge conducts a balancing of privacy interests against an accused person’s right to make a full answer and defence; if disclosure is ordered, the Crown must provide relevant parts while protecting sensitive information as much as possible.  For practical guidance and 30+ year experienced lawyer services with LSO tribunal representation across Ontario, call (416) 488-4110.

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Decision Summary: R. v. O'Connor

The case of R. v. O'Connor, [1995] 4 S.C.R. 411, is a pivotal case heard by the Supreme Court of Canada that established important procedures in criminal proceedings concerning the disclosure of third-party records.  This landmark decision has significant implications and impact upon privacy rights of third party persons as well as the right to a fair trial for an accused person.

Note: Please contact Lo Greco Law by phone at: (416) 488-4110 to discuss any specific questions that you may have.

Key issues addressed in this case include:

  • Disclosure of Third-Party Records:
    The question of how third-party records, such as medical or counselling records, should be handled when requested by the defence in a criminal trial.
  • Balancing of Rights:
    The challenge of balancing the privacy rights of individuals with the right to make a full answer and defence of the accused person.
  • Judicial Procedures:
    The processes and legal standards established to review and disclose such records.
Details and Insights
  • Application by Defence:
    The defence must apply to the court, demonstrating that the third-party records are likely relevant to an issue in the trial or the competence of a witness to testify.  This application is a crucial first step that ensures the necessity of the records is established before any disclosure.
  • Initial Judicial Review:
    The judge conducts an initial review to determine whether the records are "likely relevant."  If deemed potentially relevant, the judge will order the records to be produced to the court for further examination.  This step provides a preliminary check on the validity of the request.
  • Balancing Test:
    The judge, once the records are received and reviewed, balances the privacy rights of the third party individual against the right to make full answer and defence as held by the accused person.  This balancing test is vital to ensure that respect for the rights of all persons.
  • Disclosure:
    The prosecutor, if the judge deems that such records are necessary for the accused to make a full answer and defence, must provide disclosure of relevant parts of the records.  This step ensures transparency and fairness in the trial while protecting sensitive personal information as much as possible.

The official case judgment is available here: R. v. O'Connor, [1995] 4 S.C.R. 411

Conclusion

In summary, R. v. O'Connor set out essential procedures for the disclosure of third-party records in criminal proceedings, balancing privacy concerns with the right to a fair defence.

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