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 PersonIn cases alleging an offence, the concept of disclosure is a critical aspect to the upholding of a fair and equitable judicial system. Disclosure mandates that the prosecution must provide all relevant evidence to either the defence representative or, if unrepresented, directly to the accused individual. Comprehending the nuances of disclosure is vital for effectively planning a defence strategy and for preserving the rights of the accused person. Key concerns frequently encountered with disclosure 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 a continuous obligation to provide all relevant information to the defence as is in line with the principles set out in R. v. Stinchcombe, [1991] 3 S.C.R. 326, whereas the Supreme Court determined that failing to meet 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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