What is the test for a motion to exclude evidence that a witness is afraid to testify?

Evidence Code section 352 permits the exclusion of relevant evidence where "its probative value is substantially outweighed by the probability that its admission will (a) necessitate undue consumption of time or (b) create substantial danger of undue prejudice, of confusing the issues, or of misleading the jury." (Evid. Code, 352.) We review a trial court order denying a motion to exclude evidence under Evidence Code section 352 for abuse of discretion. (People v. Williams (1997) 16 Cal.4th 153, 213.)

"Evidence that a witness is afraid to testify or fears retaliation for testifying is relevant to the credibility of that witness and is therefore admissible. [Citations.] An explanation of the basis for the witness's fear is likewise relevant to her credibility and is well within the discretion of the trial court." (People v. Burgener (2003) 29 Cal.4th 833, 869 (Burgener).)