The respondents were charged with conspiracy to commit robbery.
At trial, they sought to introduce the results of a polygraph examination to support their credibility and deny participation in the conspiracy.
The trial judge refused to admit the evidence, and they were convicted.
The Court of Appeal allowed their appeal and ordered the trial reopened to consider the polygraph evidence.
The Supreme Court of Canada allowed the Crown's appeal, holding that polygraph evidence is inadmissible in criminal proceedings because it offends the rules against oath-helping, past consistent statements, and character evidence, and because assessing credibility is the exclusive province of the trier of fact.
