(1) Evidence of an admission is not admissible unless the court is satisfied that the admission, and the making of the admission, were not influenced by—
(a) violent, oppressive, inhuman or degrading conduct, whether towards the person who made the admission or towards someone else; or
(b) a threat of conduct mentioned in paragraph (a).
(2) Subsection (1) only applies if the party against whom evidence of the admission is presented has raised in the proceeding an issue about whether the admission or its making were influenced in a way mentioned in subsection (1).