If the Fire Marshal shall be of the opinion that there is evidence sufficient to charge any person with the crime of arson, or with the attempt to commit the crime of arson, or of conspiracy to defraud, or criminal conduct in connection with any fire, he shall cause such person to be lawfully arrested and charged with such offense, and shall furnish to the proper prosecuting attorney all such evidence, together with the names of witnesses and all the information obtained by him, including a copy of all pertinent and material testimony taken in the case.