Special rules are applicable by statute and at common law in determining the admissibility in a criminal trial of confessions of guilt.
The New South Wales Crimes Act 1900, S. 410, provides 1 No confession, admission, or statement shall be received in evidence against an accused person if it has been induced-(a) by any untrue representation made to him; or (b) by any threat or promise, held out to him by the prosecutor, or some person in authority. 2 Every confession, admission, or statement made after any such representation or threat or promise shall be deemed to have been induced thereby, unless the contrary be shown.
In the present case there is no evidence which makes it possible to reject the confession either to Graham or to the police on any of the grounds referred to in this section. There is no evidence whatever of any untrue representation being made to the accused person or of there being any threat or promise held out to him by any person.
This statutory provision, however, does not exclude the application of the common law (Attorney-General for New South Wales v. Martin (1) ). At common law a confession of an accused person is not admissible upon his trial unless it is shown by the Crown to be free and voluntary, that is, not to have been induced by violence or by any threat or promise held out by any person in authority. In the present case there is, as already stated, no evidence of any threat or promise and no evidence of any violence. Accordingly, neither the statutory provision quoted nor the common law relating to the voluntary character of confessions as it is ordinarily stated make Sinclair's confessions inadmissible in the present case.
It is contended, however, that the basis of the common law rule is to be found in the fact that confessions induced by violence or by threats or promises by people in authority are likely to be untrue and that the danger is SO great that therefore it is better that they should not be allowed to go before a jury: See, e.g. R. v. Warick:- shall (2):
a confession forced from the mind by the flattery of hope, or by the torture of fear, comes in SO questionable a shape when it is to be considered as the evidence of guilt, that no credit ought to be given to it; and therefore it is rejected." Mr. Windeyer referred to the full treatment of this subject in Wigmore on Evidence, 3rd ed. (1940), vol. 3, p. 30, and particularly to vol. 4, S. 822, where the fundamental principle is stated to be that confessions obtained as the result of violence, promises or threats by persons in authority are, because of the conditions under which they have been
1(1909) 9 C.L.R. 713.
2(1783) 1 Leach 263, at p. 264 [168
E.R 234, at p. 235].