Section 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.