Criminal negligence is one of the most misunderstood concepts in Canadian criminal law, in part because it borrows a word - negligence - from the civil law where it means something far less serious. Under section 219 of the Criminal Code, criminal negligence is not mere carelessness. It captures conduct, whether by act or by omission of a legal duty, that shows wanton or reckless disregard for the lives or safety of other persons.
When that conduct causes death, the Crown can charge criminal negligence causing death under section 220, an indictable offence carrying a maximum of life imprisonment. Because it is a form of culpable homicide, it sits alongside unlawful act manslaughter as one of the principal routes by which an unintended death becomes a manslaughter prosecution.
This article supports our criminal negligence manslaughter defence checklist, a dedicated fork of the broader manslaughter matter plan. Use it for the stage-by-stage duty and departure analysis, trial strategy, and sentencing considerations.
Section 219: The Definition of Criminal Negligence
Section 219 defines criminal negligence as doing anything, or omitting to do anything that it is one's legal duty to do, in a way that shows wanton or reckless disregard for the lives or safety of others. The reference to a legal duty matters: liability by omission requires a duty imposed by law, such as the duty to provide the necessaries of life. This duty element is often the first place a defence to a criminal negligence charge in Canada can be built.
Criminal Negligence Causing Death (Section 220)
Section 220 elevates criminal negligence to a homicide offence where death results. A four-year mandatory minimum applies where a firearm is used, mirroring the structure of manslaughter sentencing under section 236. Because the charge is a species of culpable homicide under sections 222 and 234, much of the trial architecture overlaps with the wider manslaughter defence workflow, including bail, election, and disclosure obligations.
The Marked and Substantial Departure Standard
The fault element is where criminal negligence is won or lost. The objective standard of care derives from R. v. Creighton [1993] 3 SCR 3, but criminal negligence demands more than the simple carelessness of civil law. In R. v. J.F. 2008 SCC 60, the Supreme Court confirmed that criminal negligence requires a marked and substantial departure from the conduct of a reasonable person - a higher threshold than the marked departure that grounds penal negligence offences such as the dangerous driving considered in R. v. Beatty 2008 SCC 5.
- Challenge the standard of care: what would the reasonable person have done in the specific circumstances?
- Attack the degree of departure: was the conduct merely a marked departure, which is insufficient, rather than marked and substantial?
- Contest the source and scope of any legal duty relied on for an omission.
- Test medical and factual causation, applying the significant contributing cause standard from R. v. Nette 2001 SCC 78.
Criminal Negligence Versus Unlawful Act Manslaughter
Both criminal negligence causing death and unlawful act manslaughter are culpable homicides, but they are proven differently. Unlawful act manslaughter requires an underlying dangerous unlawful act and objective foreseeability of bodily harm, while criminal negligence focuses on the wanton or reckless quality of the accused's conduct or omission. Where the Crown advances both theories, defence counsel should map each carefully; the unlawful act manslaughter pathway addresses that alternative route, while the criminal negligence manslaughter pathway isolates the duty and departure analysis specific to section 219.
Common Factual Settings for Criminal Negligence
Criminal negligence charges tend to arise from a recurring set of fact patterns: workplace fatalities where a safety system failed, medical misadventure, unsafe firearm storage, motor vehicle deaths charged as criminal negligence rather than dangerous driving, and the failure to provide the necessaries of life to a child or a dependent adult. Each setting frames the duty question differently. In an omission case, counsel must identify precisely which legal duty the Crown says was breached, because without a recognised duty there is no foundation for liability under section 219. In a positive-act case, the analysis shifts to whether the conduct crossed from carelessness into wanton or reckless disregard.
Sentencing is equally fact-driven. Criminal negligence causing death carries no general mandatory minimum, but a four-year minimum attaches where a firearm is used, and the constitutionality of that floor was upheld in R. v. Ferguson 2008 SCC 6. For Indigenous accused, the court must apply the Gladue framework, considering systemic and background factors as part of an individualised assessment of moral blameworthiness. These sentencing considerations are folded into the trial-litigation stages of the dedicated criminal negligence workflow so that mitigation is built from the first appearance rather than assembled at the end.
Using the Matter Plan
A criminal negligence prosecution turns on fine distinctions between civil carelessness, penal negligence, and the marked and substantial departure required for criminal liability. The full workflow for defending manslaughter charges in Canada sets out the procedural backbone, and the dedicated criminal negligence manslaughter fork drills into the duty analysis, the heightened fault standard, and the causation arguments that most often decide these cases at trial.