"The principles governing the admissibility of
evidence of similar facts in criminal cases were
quite recently restated in Markby v. The Queen
[1978] HCA 29; (1978) 140 C.L.R. 108 at pp. 116-117. They derive
from the well known statement of Lord Herschell
L.C. in Makin v. Attorney-General (N.S.W.) (1894)
A.C. 57 at p. 65. The prosecution cannot adduce
evidence tending to show that the accused has been
guilty of criminal acts other than those with
which he is charged if the evidence shows only
that he had a propensity to commit crime, or crime
of a particular kind, or that he was the sort of
person likely to have committed the crime charged.
On the other hand, if the evidence is relevant in
some other way, it is admissible even though it
reveals that the accused was disposed or likely to
commit the sort of crime with which he is charged.
Cases since Makin v. Attorney-General (N.S.W.)
have established that even if the evidence is
legally admissible, the trial judge has a
discretion to exclude it if its prejudicial effect
is likely to be out of proportion to its true
evidential value.
. . . . .
It is true that in deciding whether the evidence
is admissible, questions of degree arise and that
the judgment to be made is to some extent
discretionary. It was said in Harris v. Director
of Public Prosecutions (1952) A.C. at p. 710, that
evidence of similar facts, to be admissible, must
have 'a really material bearing' on the issues to
be decided. The judgments in Reg. v. Boardman
show that there are degrees of relevance, and I
respectfully agree with the statement of Lord
Wilberforce that the evidence to be admissible
must have a 'strong degree of probative force':
Reg. v. Boardman (1955) A.C. at p. 444; see also
at pp. 439, 452-453, 456. In Reg. v. Chee (1980)
V.R. 303 at p. 308, the Full Court of the Supreme
Court of Victoria held that it was enough that the
similar fact evidence should have some probative
force, by which no doubt was meant probative force
other than merely by way of showing that the
accused had a propensity to commit the sort of
crime with which he was charged or was the sort of
person who was likely to commit such a crime. It
was there said that it was not a condition of
admissibility that the evidence should have a high
degree of probative force. With all respect, it
is not right to treat evidence which tends to show
the commission by the accused of other criminal
acts in the same way as any other circumstantial
evidence. In the first place, as I have already
said, a jury might place too much weight on the
fact that the accused had a criminal tendency.
Secondly, evidence of this kind will often raise
difficult and doubtful questions as to whether the
accused had in fact been guilty of other criminal
acts, and may distract the attention of the jury
from the vital issues in the case. It is
therefore not enough that the evidence should be
only technically relevant (otherwise than as
showing a propensity); it must be really
material; it must have strong probative force."
Evidence of similar facts is of particular relevance when purpose or