§ 25. Witness exempt from arrest. A person duly and in good faith
subpoenaed or ordered to attend, for the purpose of being examined, in a
case where his attendance may lawfully be enforced by attachment or by
commitment, is privileged from arrest in a civil action or special
proceeding, while going to, remaining at, and returning from, the place
where he is required to attend. An arrest, made contrary to the
provisions of this section, is absolutely void and is a contempt of the
court, if any, from which the subpoena was issued, or by which the
witness was directed to attend.