(a) Examining Witness Concerning Prior Statement. A party examining a witness about a prior written or oral statement made by the witness need not show it to the witness or disclose its contents at that time, provided that before the end of the examination (1) the statement, if written, is disclosed to the witness and the parties, or if the statement is oral, the contents of the statement and the circumstances under which it was made, including the persons to whom it was made, are disclosed to the witness and (2) the witness is given an opportunity to explain or deny it.

(b) Extrinsic Evidence of Prior Inconsistent Statement of Witness. Unless the interests of justice otherwise require, extrinsic evidence of a prior inconsistent statement by a witness is not admissible under this Rule (1) until the requirements of section (a) have been met and the witness has failed to admit having made the statement and (2) unless the statement concerns a non-collateral matter.

Source: This Rule is derived from F.R.Ev. 613.