Iowa Code § 622B.2: Interpreter appointed.

If a deaf or hard-of-hearing person is a party to, a witness at, or a participant in a proceeding before a grand jury, court, or administrative agency of this state, the court or administrative agency shall appoint a sign language interpreter without expense to the deaf or hard-of-hearing person to interpret or translate the proceedings to the deaf or hard-of-hearing person and to interpret or translate the person’s testimony unless the deaf or hard-of-hearing person waives the right to a sign language interpreter.