If a witness testifies at trial the traffic light was red, the accused may ask if they told the police officer the light was green. And, depending on the answer the accused may offer extrinsic evidence of the inconsistency. This is a clear prior inconsistent statement. Usually there is no trouble identifying the issue. But what happens if the witness says I don’t remember, or is vague, evasive or something else?
The NMCCA has an unpublished opinion in United States v. Corcoran, which should be read for a fuller and better reminder of when a witness may be impeached with a prior inconsistent statement, and most importantly when extrinsic evidence may be offered.
In United States v. Harrow, 65 M.J. 190 (C.A.A.F. 2007). The court talked about the process of impeachment by prior inconsistent statement. It is a tool to question the witness and “By showing self-contradiction, the witness can be discredited as a person capable of error.” United States v. Banker, 15 M.J. 207, 210 (C.M.A. 1983). M.R.E. 613(b) allows extrinsic evidence of a prior inconsistent statement if the witness has been first given a chance to explain or deny the statement. Keep in mind that there can be no extrinsic evidence if the witness admits making the prior inconsistent statement. United States v. Gibson, 39 M.J. 319, 324 (C.M.A. 1994).