Section 28-401.20. Cooperation required

Any   person,   including   any
  corporation, partnership, business or other entity, issued a license  or
  certificate of competence by the department shall, pursuant to a request
  or  order  of  the  commissioner  or  any  other  city agency or office,
  cooperate fully and completely with respect to any  department  or  city
  agency  or  office investigation. Evidence of cooperation shall include,
  but is not limited to, appearing before the  department  or  other  city
  agency  or  office,  answering  questions completely and accurately, and
  providing any and all requested documents. Failure to comply  with  such
  request  or  order  may  subject  such  person  to disciplinary measures
  authorized by law, including but not limited to suspension or revocation
  of the license or certificate of competence.