What is the test for denying a witness's testimony?

^5. The instruction at issue in People v. Kondor, supra, 200 Cal.App.3d 52, was CALJIC No. 2.62, an earlier version of CALCRIM No. 361. CALJIC No. 2.62 states: "In this case defendant has testified to certain matters. [] If you find that [a] [the] defendant failed to explain or deny any evidence against [him] [her] introduced by the prosecution which [he] [she] can reasonably be expected to deny or explain because of facts within [his] [her] knowledge, you may take that failure into consideration as tending to indicate the truth of this evidence and as indicating that among the inferences that may reasonably be drawn therefrom those unfavorable to the defendant are the more probable. [] The failure of a defendant to deny or explain evidence against [him] [her] does not, by itself, warrant an inference of guilt, nor does it relieve the prosecution of its burden of proving every essential element of the crime and the guilt of the defendant beyond a reasonable doubt. [] If a defendant does not have the knowledge that [he] [she] would need to deny or to explain evidence against [him,] [her,] it would be unreasonable to draw an inference unfavorable to [him] [her] because of [his] [her] failure to deny or explain this evidence."