Section 331.5. Discovery; protective orders, continuing duty to disclose

1.
  The  court  may, upon motion of either party, or of any affected person,
  or upon determination of a motion  of  either  party  for  an  order  of
  discovery, or upon its own initiative, issue a protective order denying,
  limiting, conditioning, delaying or regulating discovery for good cause,
  including   constitutional  limitations,  danger  to  the  integrity  of
  physical evidence or a substantial risk of physical harm,  intimidation,
  economic  reprisal, bribery or unjustified annoyance or embarrassment to
  any person or an  adverse  effect  upon  the  legitimate  needs  of  law
  enforcement,   including   the  protection  of  the  confidentiality  of
  informants, or any other factor or set of factors  which  outweighs  the
  usefulness of the discovery.
    2.  An  order limiting, conditioning, delaying or regulating discovery
  may, among other things, require that any  material  copied  or  derived
  therefrom  be maintained in the exclusive possession of the attorney for
  the discovering party and be used for the exclusive purpose of preparing
  for the defense or presentment of the action.
    3. A motion for a protective order  shall  suspend  discovery  of  the
  particular matter in dispute.
    4.  If,  after complying with the provisions of sections 331.2 through
  331.7 or an order pursuant thereto, a  party  finds,  either  before  or
  during   the   fact-finding  hearing,  additional  material  subject  to
  discovery or covered by such order, he shall promptly  comply  with  the
  demand  or  order,  refuse  to  comply  with the demand where refusal is
  authorized, or apply for a protective order pursuant to this section.