Section 335.1. Notice of defense of mental disease or defect

Evidence of
  mental disease or defect of the respondent excluding his  responsibility
  under  this article is not admissible at the fact-finding hearing unless
  the respondent serves upon the presentment agency  and  files  with  the
  court  a  written  notice  of  intention to rely upon such defense. Such
  notice must be served and filed before the fact-finding hearing and  not
  more  than  thirty  days after the conclusion of the initial appearance,
  whichever is sooner. In the interest  of  justice  and  for  good  cause
  shown,  however, the court may permit such service and filing to be made
  at any later time prior to the conclusion of the fact-finding hearing.