Ohio Rev. Code Ann. § 3737.26

If the fire marshal or an assistant fire marshal determines that there is evidence sufficient to charge a person with arson or a similar crime, or with a violation of section 3737.62 of the Revised Code, the marshal or assistant marshal may arrest the person or cause the person to be arrested and charged with the offense. The fire marshal or assistant fire marshal shall provide the prosecuting attorney the evidence, the names of witnesses, and a copy of material testimony taken in the case.