R v Grainger

R. v. Grainger

[1958] O.J. No. 218
Ontario Supreme Court - Court of Appeal — Porter C.J.O., Roach and Gibson JJ.A. | May 15, 1958

Background

On January 13, 1958, Grainger was caught driving 45 mph in a 30 mph zone on King Street West in Toronto at 11:10 a.m. The evidence against him came entirely from a radar speedmeter operated by a police officer. When Grainger appeared in Police Court, his lawyer made a preliminary objection — the Crown should have to qualify the officer as an expert before allowing radar evidence.

The officer admitted he wasn't an electronics expert and couldn't explain the scientific mechanism behind the radar. But he testified that he'd spent two weeks familiarizing himself with the machine, that police technicians maintained it well, that he calibrated it using a tuning fork that morning, and that in his experience the data was "extremely accurate." The magistrate convicted Grainger and fined him $50 (he had previous speeding convictions). Grainger's lawyer applied to state a case, arguing the radar evidence was "incompetent and inadmissible" without proper proof.

Issues

1. Can radar evidence be admitted without qualifying the operating officer as an expert in electronics?
2. What foundation must be laid before radar speedmeter readings can be admitted as evidence?

The Radar Evidence Foundation

The Court of Appeal upheld the conviction, establishing that you don't need an electronics expert to operate radar — just someone who knows how to use it properly. Justice Roach found that the officer's evidence implicitly established three key things: (1) the radar machine was capable of accurately measuring vehicle speeds when properly used, (2) it was in good working condition at the time, and (3) it was being properly operated.

The court emphasized that while the officer couldn't give a scientific explanation of radar technology, he was familiar with proper operation procedures, had two weeks of training, and calibrated the device that morning with a tuning fork. His testimony that the machine was "extremely accurate" based on his experience was sufficient foundation. The court noted that if the defence believed the radar was unreliable, they could have called their own evidence to challenge it — but Grainger didn't.

This became a foundational case establishing that radar evidence doesn't require expert scientific testimony about electromagnetic waves and Doppler shift principles — just testimony from a trained operator about proper use, calibration, and accuracy based on experience.

Key Takeaway

Radar evidence can be admitted through a trained operator's testimony alone, without requiring an electronics expert.

If you're challenging radar evidence, focus on questioning the officer's training, calibration procedures, and maintenance records rather than demanding scientific expertise. The burden is on you to present evidence that the specific radar unit was malfunctioning or improperly used.