The appellants were convicted of conspiring to affect the public market price of shares.
At trial, the Crown relied on accomplice testimony.
The trial judge warned the jury about the danger of uncorroborated accomplice testimony but left them free to find corroboration in other parts of the evidence.
Crucially, the trial judge failed to instruct the jury that certain evidence suggested by the Crown as corroborative could not, as a matter of law, provide corroboration.
The Supreme Court of Canada held this was a fatal error and declined to apply the curative proviso under s. 613(1)(b)(iii) of the Criminal Code, as the Crown did not demonstrate the verdict would necessarily have been the same.
The appeal was allowed and a new trial ordered.