All patients committed pursuant to section 66-329, Idaho Code, shall be entitled to a reexamination of the order for or conditions of his commitment on his own petition, or that of his legal guardian, parent, spouse, relative, attorney or friend, to the district court of the county in which the patient was committed or is found. Within three (3) years of the effective date of this act, the department shall petition for the reexamination of all patients committed pursuant to section 66-329, Idaho Code, prior to the effective date of this act. Upon receipt of the petition the court shall determine whether the conditions justifying involuntary care and treatment continue to exist except that such proceedings shall not be required to be conducted if the petition is filed sooner than four (4) months after the issuance of the order of commitment or sooner than one (1) year after the filing of a previous petition under this section.