Nothing in this chapter shall be construed as to affect the procedure for the ordinary conduct of criminal trials as otherwise set up by law. Nothing in this chapter shall be construed to prevent the defendant, his or her attorney, or the court of its own motion, from producing evidence and witnesses at the hearing on the probable existence of sexual psychopathy or at the hearing after the return of the superintendent's report. Nothing in this chapter shall be construed as affecting the laws relating to the criminally insane or the insane criminal, nor shall this chapter be construed as preventing the defendant from raising the defense of insanity as in other criminal cases.