Disclosure Principles: Prosecutorial Mandate to Provide Relevant Evidence to the Accused Person | Lo Greco Law


Last Updated: August 26 2026

Question:How can I request disclosure from the prosecutor in Ontario criminal proceedings?

Answer:In Ontario criminal matters, you can request disclosure by promptly contacting your defence lawyer to ask the Crown for full, timely disclosure of all relevant evidence, including disclosure that is ongoing as cases progress, based on the principles confirmed in R. v. Stinchcombe, [1991] 3 S.C.R. 326   and the need to address delay or incomplete disclosure noted in R. v. McNeil, [2009] 1 S.C.R. 66.   If records are held by third parties or involve digital evidence issues, your lawyer can also seek appropriate production and rulings referencing York (Regional Municipality) v. McGuigan, 2018 ONCA 1062 and R. v. O'Connor, [1995] 4 S.C.R. 411.   Lo Greco Law provides 30+ year experienced lawyer services with LSO tribunal representation across Ontario, including Aurora and the GTA, so you can move your case forward with clear disclosure expectations; call (416) 488-4110 to discuss your next steps.

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Understanding the Principles Guiding Disclosure Requirements

Disclosure Principles: Prosecutorial Mandate to Provide Relevant Evidence to the Accused PersonWithin prosecutorial proceedings, the principle of disclosure is a fundamental element to ensuring that judicial process is fair and just.  Disclosure involves the process through which the prosecution provides all relevant evidence to the defence representative or directly to the accused person.  Understanding the complexities of disclosure is essential for navigating the defence process and for effective safeguarding of the rights of the accused person.  Key general issues often encountered on the topic of disclosure requirements include:

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

  • Obligation of Full Disclosure: The prosecution has an ongoing duty to disclose all relevant information to the defence as per principles established within R. v. Stinchcombe, [1991] 3 S.C.R. 326, wherein the Supreme Court deemed that failure to uphold this duty can undermine the fairness of the trial.
  • Timing and Completeness: The timely and thorough disclosure of pertinent evidence is essential, whereas the R. v. McNeil, [2009] 1 S.C.R. 66, case establishes that any delays or incomplete disclosures can severely prejudice and hinder the accused person during the preparation for trial.
  • Emerging Challenges: The complications surrounding digital evidence as noted in York (Regional Municipality) v. McGuigan, 2018 ONCA 1062, and the acquisition of third-party records under R. v. O'Connor, [1995] 4 S.C.R. 411, among other matters, pertain to evidentiary materials in the possession of, accessible to, or potentially within reach of, the prosecutor.
Conclusion

The concept of disclosure is vital in maintaining the integrity of prosecutorial actions. Influential court decisions, including Stinchcombe, McNeil, McGuigan, and R. v. O'Connor, set forth the duties upon a prosecutor to disclose evidence comprehensively and promptly. Effective understanding of these disclosure principles is crucial for upholding justice and enabling the defence to ensuring a fair trial is brought against an accused person.

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