Testimony is given under oath and witnesses may be cross‐examined. The Federal Rules of Evidence serve as guidelines but are not rigidly enforced.The FAA provides limited authority to subpoena witnesses or a summons to a hearing under Section 7. (a) The panel shall conduct the hearing with due regard to the law and established rules of evidence, which shall be liberally construed to promote justice. The FAA applies to any contract "evidencing a transaction involving commerce" that is subject to a written agreement to arbitrate. Federal Rules of Civil Procedure, referred to in text, are set out in Appendix to Title 28, Judiciary and Judicial Procedure. Amendments.