Section 620.40. Material witness order; arraignment

1.    When the prospective witness appears before the court, the court
  must inform him of the nature and purpose of the proceeding, and that he
  is entitled to a prompt hearing upon the issue of whether he  should  be
  adjudged  a material witness.  The prospective witness possesses all the
  rights, and is entitled to all the court instructions, with  respect  to
  right  to  counsel,  opportunity  to  obtain  counsel  and assignment of
  counsel in case of financial inability to retain such,  which,  pursuant
  to  subdivisions  three  through  five  of  section  180.10, accrue to a
  defendant arraigned upon a felony complaint in a local criminal court.
    2.   If the  proceeding  is  adjourned  at  the  prospective  witness'
  instance,  for  the purpose of obtaining counsel or otherwise, the court
  must order him to appear upon the adjourned date.  The court may further
  fix bail to secure his appearance upon such date or until the proceeding
  is completed and, upon default thereof, may commit him to the custody of
  the sheriff for such period.