Section 15-218. Purposes of investigations

The commissioner, the chief and
  deputy chief fire marshals, the assistant fire marshals, and such  other
  employees  of  the  department  designated  by  the  commissioner, shall
  investigate, examine and inquire into the following matters:
    1.  The  origin,  detail  and  management  of  fires  in   the   city,
  particularly  of  supposed cases of arson, incendiarism, or fires due to
  criminal carelessness.
    2. The violation of any of the several regulations, orders, or special
  directions issued by the commissioner, for the  purpose  of  discovering
  any delinquency in the performance of duty, or violations of discipline,
  on the part of any officer, agent, or employee of the department.
    3.  The  violation, or supposed violation, of any of the provisions of
  this title or chapter four of title twenty-seven of the code.