(b)
Specific Instances of Conduct. Specific instances of the conduct of a witness, for the purpose of attacking or supporting the witness’ character for truthfulness, other than conviction of crime as provided in rule
609, may not be proved by extrinsic evidence. They may, however, in the discretion of the court, if probative of truthfulness or untruthfulness, be inquired into on cross-examination of the witness
(1)
concerning the witness’ character for truthfulness or untruthfulness, or
(2)
concerning the character for truthfulness or untruthfulness of another witness as to which character the witness being cross-examined has testified.
The giving of testimony, whether by an accused or by any other witness, does not operate as a waiver of the accused’s or the witness’ privilege against self-incrimination when examined with respect to matters that relate only to character for truthfulness.