No license shall be issued or renewed under this article unless the applicant, licensee, owner, operator, person in charge, or all employees who have supervisory duties in regard to the care of the patients of the institution, are of good moral, reputable and responsible character. In determining such character, the director shall consider police and penal history, including all convictions of the persons and the reasons therefor; license history, including whether such persons, in previously operating such an institution in this or another state, or in previous employment, have had a license revoked or suspended, the reasons therefor, and the demeanor of the persons subsequent to such action; general personal history, including such other facts relevant to the general personal history of the persons as the director shall find necessary to a fair determination of good character. The director shall have the authority to make such investigations as he may deem necessary in making determinations hereunder, and may request investigation and approval by the county police department of any applicant, owner, operator, licensee or person in charge of such institution, or employed by such institution, whenever he shall deem it necessary for the welfare of the patients. Doubts arising in connection with any investigation hereof shall be resolved in favor of the welfare, health and safety of the patients. (Mont. Co. Code 1965, § 89-15.)