Section 334E-3 - Investigation procedures(a) In an investigation pursuant to section 334E-2(c), the department of health may:(1) Make inquiries and obtain information as deemed necessary;(2) Enter without notice to inspect the premises of a psychiatric facility; provided that such entry shall be authorized by the department in writing and that such authorization shall be furnished upon entry to the person in charge of the facility; and(3) Hold private hearings.(b) The department of health shall maintain secrecy in respect to all matters including the identities of the complainants or witnesses, except so far as disclosures may be necessary to enable it to carry out duties and to support recommendations.