(a) 
The fire marshal shall investigate the cause, origin and circumstances of every fire occurring within this city by which property has been destroyed or damaged, and shall especially make investigation as to whether such fire was the result of carelessness or design. Such investigation shall be begun within twenty-four (24) hours, not including Sunday, of the occurrence of such fire. The fire marshal shall keep in his office a record of all fires, together with all facts, statistics and circumstances, including the origin of the fires and the amount or the loss, which may be determined by the investigation required by this section.
(b) 
In addition to his other duties, the fire marshal shall be the head of the fire prevention bureau and responsible for its accomplishment of all of the tasks delegated to it by the fire chief, including, but not limited to, the running of a fire prevention program within the city.
(1996 Code, sec. 5.203)
The fire marshal, when in his opinion further investigation is necessary, shall take or cause to be taken the testimony, on oath, of all persons supposed to be cognizant of any facts or to have means of knowledge in relation to the matter under investigation, and shall cause the same to be reduced to writing; and if he shall be of the opinion that there is evidence sufficient to charge any person with the crime of arson, or the attempt to commit the crime of arson, or of conspiracy to defraud or criminal conduct in connection with such fire, he shall cause such person to be lawfully arrested and charged with such offense or either of them, and shall furnish to the proper prosecuting attorney all such evidence, together with the names of witnesses and all of the information obtained by him, including a copy of all pertinent and material testimony taken in the case.
(1996 Code, sec. 5.204)
The fire marshal shall have the power to summon witnesses before him to testify in relation to any matter which is by the provisions of this division a subject of inquiry and investigation, and may require the production of any book, paper or document deemed pertinent thereto. The fire marshal is hereby authorized and empowered to administer oaths and affirmations to any person appearing as witnesses before him.
(1996 Code, sec. 5.205)
Any witness who refuses to be sworn, or who refuses to appear or testify, or who disobeys any lawful order of the fire marshal, or who disobeys, fails or refuses to produce any book, paper or document touching any matter under examination, or who is guilty of any contemptuous conduct during any of the proceedings of the fire marshal in the matter of said investigation or inquiry, after being summoned to give testimony in relation to any matter under investigation as aforesaid, shall be deemed guilty of a misdemeanor, and it shall be the duty of the fire marshal to cause all such offenders to be prosecuted. Provided, however, that any person so convicted shall have the right of appeal.
(1996 Code, sec. 5.206)
All investigations held by or under the direction of the fire marshal may, in his discretion, be private, and persons other than those required to be present may be excluded from the place where such investigation is held, and witnesses may be kept separate and apart from each other and not allowed to communicate with each other until they have been examined.
(1996 Code, sec. 5.207)
The fire marshal shall have the authority at all times of day or night, when necessary, in the performance of the duties imposed upon him by the provisions of this division, to enter upon and examine any building or premises where any fire has occurred, and other buildings and premises adjoining or near the same, which authority shall be exercised only with reason and good discretion. Should entry be denied, the fire marshal shall have the authority to apply for a search warrant to obtain entry.
(1996 Code, sec. 5.208)
The fire marshal, upon complaint of any person having an interest in any building or property adjacent, and without any complaint, shall have a right at all reasonable hours, for the purpose of examination, to enter into and upon all buildings and premises within the city, and it shall be his duty, monthly or more often, to enter upon and make, or cause to be entered and made, a thorough examination of mercantile, manufacturing and public buildings, together with the premises belonging thereto. At the end of each month, the fire marshal shall report to the state fire marshal all existing hazardous conditions, together with a separate report on each fire in the city during the month.
(1996 Code, sec. 5.209)