Can a surreptitious audio recording be admitted into evidence in a voir dire?

For example, in Lam v. Chiu, 2012 BCSC 440, Gray J. held a voir dire to address a surreptitious audio recording that was said to prove the existence of a personal loan between the plaintiff and defendant. Gray J. ultimately permitted the audio recording to be admitted into evidence. She pointed out that the law generally countenances admission of such evidence except in the context of child custody matters or other disputes where an ongoing relationship of trust needed to be maintained. Because the relationship between the plaintiff and defendant did not fall into these categories, and even though Gray J. considered the surreptitious recording as “unfair”, this was insufficient to refuse admittance of otherwise probative and relevant evidence.