Section 240.35. Discovery; refusal of demand

Notwithstanding  the  provisions  of  sections  240.20 and 240.30, the
  prosecutor or the defendant, as the case may be, may refuse to  disclose
  any  information  which  he reasonably believes is not discoverable by a
  demand to produce, pursuant to section 240.20 or section 240.30  as  the
  case  may  be,  or  for  which he reasonably believes a protective order
  would be warranted.   Such refusal shall be made  in  a  writing,  which
  shall  set  forth  the  grounds  of  such  belief  as fully as possible,
  consistent with the objective of the refusal.    The  writing  shall  be
  served  upon  the  demanding  party  and  a copy shall be filed with the
  court.