The credibility of a witness may be attacked by any party, including the party calling the witness.
§ 2607.Who May Impeach
Chapter 40: Oklahoma Evidence Code · Last amended November 1, 2002 · Last verified August 3, 2026
In one sentenceSection 2607 lets any party attack a witness's credibility, including the party that called the witness, doing away with the old common-law rule that a party vouched for -- and couldn't impeach -- its own witness.
Full Text of § 2607
Amendment History
Laws 1978, SB 276, c. 285, § 607, eff. 10/1/1978; Amended by Laws 2002, HB 1939, c. 468, §46, eff. 11/1/2002.
Plain-English Summary
Section 2607 lets any party attack a witness's credibility -- including the party who called that witness in the first place. That single sentence eliminates the older common-law "voucher rule," under which a party who put a witness on the stand was treated as vouching for that witness and couldn't attack the witness's own credibility.
Frequently Asked Questions
Can a lawyer impeach a witness the lawyer's own side called?
Yes. Section 2607 allows any party, including the one that called the witness, to attack that witness's credibility.
What rule did Section 2607 replace?
The older common-law "voucher rule," which treated calling a witness as vouching for the witness and barred the calling party from impeaching its own witness.
Does this section limit how a witness may be impeached?
No. It only establishes who may impeach; Sections 2608 and 2609 set out the methods and limits.
Source & verification. Section text is reproduced verbatim from
Title 12 of the Oklahoma Statutes, enacted by the Oklahoma Legislature.
Last verified August 3, 2026.
· Official source
Also known as: who may impeach a witness oklahomaFRE 607 oklahomaimpeaching your own witness oklahoma12 O.S. § 2607