Presumption of Innocence
The presumption of innocence is the bedrock principle of Canadian criminal law: every person charged with an offence is presumed innocent until proven guilty according to law in a fair and public hearing by an independent and impartial tribunal. Section 11(d) of the Charter of Rights and Freedoms makes the presumption a constitutional guarantee. It applies from the moment a person is charged through to final disposition.
What the presumption requires
The presumption translates into several concrete requirements at every stage of the criminal process: the Crown bears the onus of proof on every essential element of the offence; the standard of proof is beyond a reasonable doubt; the accused need not testify and cannot be compelled to do so; failure to testify cannot be used against the accused; the accused need not call any evidence at all; and an acquittal must follow where reasonable doubt remains on any essential element.
Reverse onus and the limits of the presumption
Some statutory provisions reverse the onus on certain elements or defences. These provisions are subject to Charter scrutiny. The Supreme Court has held that a reverse onus on an essential element engages section 11(d) and can be justified only under section 1. Reverse-onus provisions on defences (such as the mental disorder defence) and on procedural questions (such as bail) have been upheld; reverse-onus provisions on substantive guilt have generally not been.
Statutory presumptions
Several Criminal Code presumptions allow facts to be proven by inference rather than direct evidence. Examples include: section 348(2) (intent to commit an indictable offence inferred from breaking and entering); section 354(2) (knowledge of stolen property inferred from possession); section 258 (BAC at the time of driving inferred from breath samples, subject to statutory conditions). These presumptions do not displace the ultimate Crown burden but allow specific inferences to be drawn.
The presumption in practice
The presumption operates as a constant theme through trial. In jury instructions, judges emphasize that the accused does not need to prove anything. In closing arguments, defence counsel will reference the presumption explicitly. In judicial reasoning, the standard always returns to whether the Crown has met its burden — not whether the accused has proved innocence.
Why it matters
The presumption is the structural protection against wrongful conviction. It reflects the principle that it is better for many guilty persons to be acquitted than for one innocent person to be convicted. Mass Tsang's criminal lawyers approach every case organized around the question: where does reasonable doubt come from? For more, see our blog post on the basic elements of Canadian criminal law.
Related glossary terms
