Fed. R. Evid. 603

Oath or Affirmation to Testify Truthfully

Before testifying, a witness must give an oath or affirmation to testify truthfully. It must be in a form designed to impress that duty on the witness’s conscience.

( Pub. L. 93–595, § 1 , Jan. 2, 1975 , 88 Stat. 1934 ; Mar. 2, 1987 , eff. Oct. 1, 1987 ; Apr. 26, 2011 , eff. Dec. 1, 2011 .)