positions may arise. The question may be purely one of law. In
this class of case, it is obviously for the judge. Or the legal admissi-
bility of the evidence may depend on the existence of a fact. In
this class of case, it is for the judge to hear on the voir dire, in the
absence of the jury if their hearing the evidence may prejudice the
trial, such evidence as may be adduced of the existence or non-exist-
ence of the fact and to determine whether he is satisfied of two
things, that the fact exists, and, if so, whether, as a matter of law,
its existence makes the evidence admissible or inadmissible (De Giova
v. Darling Island Stevedoring & Lighterage Oo. Ltd. (1) ). The ques-
tion whether a confession is voluntary is an instance of this (Minter
v. Priest (2)). If the admissibility of the evidence depends upon
the existence of the fact and the judge is not satisfied by the evidence
given on the voir dire that it exists, he rejects the evidence. If he
is so satisfied he admits it. But it does not follow from this that the
evidence given before him on the voir dire on the question of whether
the evidence should be admitted may not, in a proper case, be given
again in its entirety as evidence in the trial, not of course for the
purpose of inviting the jury to give a ruling on admissibility of
evidence, but for the purpose of assisting them to consider whether,
in their opinion, the evidence qualifies the weight. of the evidence
which the judge has admitted. This is a point which occurs every
day in courts exercising criminal jurisdiction. The prosecution
tenders a confession made by the prisoner to the police and subse-
quently written out and signed by him. It is almost common form
for the document to be objected to on the ground that it is not volun-
tary and for the judge, then, in the absence of the jury to hear evidence
on the voir dire from the prisoner that he was forced to make the
confession by brutal ill-treatment on the part of the police, and
from the police in denial of this allegation. If the judge is not
satisfied that the prisoner's assertions are true, he admits the confes-
sion, and afterwards the prisoner, in the witness-box, or more
commonly in a statement from the dock, repeats his allegation of
ill-treatment to the jury, who, after having heard the denials on oath
of the police officers, give it all the attention which, in their opinion,
it deserves. It has never been suggested that a trial judge acts
otherwise than with perfect propriety in taking this course ; or, on
the other hand, in rejecting the alleged confession if he thinks it
reasonably possible that there is some truth in the prisoner's assertion.