Rule 607 of the Federal Rules of Evidence is about Who May Impeach a Witness. It is under Article VI (Witnesses) of the Rules.
Any party, including the party that called the witness, may attack the witness’s credibility.
3 U.S. Code § 435 3 U.S. Code § 435 is about Generally applicable remedies and limitations. It is under Part E (General) of Subchapter 2 (Extension Of Rights
3 U.S. Code § 431 3 U.S. Code § 431 is about Application of chapter 71 of title 5, relating to Federal service labor-management relations; procedures for remedy of
3 U.S. Code § 425 3 U.S. Code § 425 is about Rights and protections under the Occupational Safety and Health Act of 1970; procedures for remedy of violations.
Rule 701 Federal Rules of Evidence Rule 701 of the Federal Rules of Evidence is about Opinion Testimony by Lay Witnesses. It is under Article VII (Opinions and Expert
