Before granting a permit under this Article, the Chief of Police may make such investigation and require such further evidence as may be necessary as to the identity and interest of the applicant and of persons other than the applicant who may be associated with him as principals or partners, or who may be in partial or total control of the establishment to be operated under the permit. The Chief of Police may also require such further evidence as may be necessary as to the character, prior conduct and general fitness of the applicant, or persons other than applicant who may be associated with him as principals or partners, or who may be in partial or total control over the place to be operated under the permit.