In any proceeding under sections 45a-603 to 45a-624, inclusive, in which the applicant has alleged that the minor has been abused or neglected, as those terms are defined in § 46b-120, or in which the probate judge has reason to believe that the minor may have been abused or neglected, the Court of Probate shall request the Commissioner of Children and Families or any organization, agency or individual licensed or approved by the commissioner, to make an investigation and written report to it, within ninety days from the receipt of such request, unless the request concerns an application for immediate temporary custody or temporary custody, in which case the commissioner shall render the report by such date as is reasonably ordered by the court. The report shall indicate the physical, mental and emotional status of the minor and shall contain such facts as may be relevant to the court’s determination of whether the proposed court action will be in the best interests of the minor, including the physical, social, mental, and financial condition of the parties, and such other factors which the commissioner or agency finds relevant to the court’s determination of whether the proposed action will be in the best interests of the minor. In any other proceeding under sections 45a-603 to 45a-624, inclusive, the court shall request an investigation and report unless this requirement is waived for cause shown. The report shall be admissible in evidence, subject to the right of any interested party to require that the person making it appear as a witness, if available, and subject to examination.