What is the effect of the knowledge of the consequences test?

He then went on to apply the knowledge of the consequences test, as referred to by Madam Justice Wilson in Clarkson v. The Queen, 1986 CanLII 61 (SCC), [1986] 1 S.C.R. 383, to the facts of this case and concluded he was not satisfied beyond a reasonable doubt that the statements in question were free and voluntary. He held in essence that he had a reasonable doubt as to whether the respondent was capable of making a rational judgment as to whether he ought, under the circumstances, to answer questions which could later be used against him at trial.