Mens Rea on a Spectrum
From subjective intent to absolute liability and the constitutional floor.
A spectrum, not a switch
Canadian criminal-law fault is a spectrum. At one end, subjective intent — what the accused actually had in mind. At the other end, absolute liability — no fault required. In between sit objective foresight, criminal negligence, and strict liability.
The constitutional floor sits at the boundary between strict and absolute liability. Reference re BC Motor Vehicle Act (1985) holds that an offence punishable by imprisonment cannot be one of absolute liability. Some fault — at minimum, a due-diligence defence — must be available.
Subjective offences
Murder (s.229 CCC), theft (s.322), assault (s.265). The Crown must prove what the accused actually intended, knew, or was wilfully blind to. Recklessness suffices for some subjective offences (assault); not for others (murder, after R v Vaillancourt and Reference re ss 193 & 195.1, requires subjective foresight of death).
Objective offences
Manslaughter (s.222(5)(a)), dangerous driving (s.320.13), failure to provide necessaries (s.215). The standard is what the reasonable person in the accused''s circumstances would have foreseen. The accused''s actual mental state is not the question.
A "marked departure" from the standard of care is required for some objective offences (dangerous driving — Beatty 2008). For criminal negligence (s.219), a "marked and substantial departure" is required (J(F) 2008).
Strict liability
Default for regulatory offences (R v Sault Ste Marie 1978). The Crown proves the actus reus; the burden then shifts to the accused to prove due diligence on a balance of probabilities. The reverse onus is constitutionally tolerable for regulatory offences in part because the penalties are typically modest.
Absolute liability
No fault required, no defence available. Constitutional only where imprisonment is not a possible consequence (Reference re BC Motor Vehicle Act). Most absolute-liability offences sit in regulatory schemes — building-code violations, parking, etc.
Reading the spectrum in practice
When analysing a Code or regulatory offence:
- Identify the offence and its statutory mens rea (express or implied).
- Locate it on the spectrum.
- For prosecution: prove the relevant fault element to the criminal standard.
- For defence: argue the appropriate fault is not made out OR that the offence as construed is unconstitutional under s.7 (BC Motor Vehicle).