Ville de Baie-Comeau v D'Astous

Ville de Baie-Comeau v. Yves D'Astous

1992 CanLII 2956 (QC CA)
Quebec Court of Appeal — Judges McCarthy, LeBel, and Gendreau | March 25, 1992

Background

Officer Picard of the Ville de Baie-Comeau was operating a radar gun on Boulevard Laflèche when he spotted Yves D'Astous's car traveling at what appeared to be excessive speed. The radar registered 114 km/h in a 50 km/h zone — more than double the speed limit. Picard intercepted D'Astous and issued a speeding ticket.

D'Astous fought the charge. The Court of Sessions of the Peace acquitted him, finding that while he likely did exceed the speed limit, the prosecution hadn't proven their case beyond a reasonable doubt. The Superior Court upheld the acquittal on appeal, ruling that the radar evidence was insufficient. The City of Baie-Comeau then appealed to the Quebec Court of Appeal.

Issues

1. What level of proof is required when radar evidence is used to establish speeding?
2. Is radar technology a matter of judicial notice, or must its reliability be proven in each case?
3. Was the evidence sufficient to prove D'Astous was speeding?

The Radar Evidence Gap

Judge Gendreau's analysis focused on a critical procedural flaw. Officer Picard had performed pre-operation tests on his radar unit using tuning forks, which showed the device was working properly. He had three years of radar experience and proper training. However, the evidence revealed a crucial missing piece: no post-operation test was conducted after the radar session ended.

The court ruled that radar technology itself is a matter of judicial notice — everyone knows radar exists and generally works. But that doesn't mean every specific radar reading is automatically reliable. The prosecution must prove that the particular device was accurate and functioning properly when it recorded the defendant's speed. This requires evidence that the operator was qualified, the device was tested before use, and crucially, that it remained accurate throughout the enforcement period.

The court explained that both pre- and post-operation testing are essential because they create a "circumstantial evidence sandwich" — if the radar worked before and after measuring the defendant's vehicle, a judge can reasonably conclude it was working accurately during the measurement. Without the post-test, that chain of reliability is broken.

Key Takeaway

Radar evidence requires proof that the device was tested both before AND after the enforcement session.

If you're challenging a radar-based speeding ticket, ask whether the officer conducted post-operation testing. Missing this crucial verification step can undermine the prosecution's entire case, even when the radar reading seems obviously accurate.