Ohio Rev. Code § 1567.06: Examination of mine generating firedamp - posting or report.

No person shall enter a mine generating firedamp, which can be detected by an approved flame safety lamp, until it has been reported safe by the person making the fire boss examination as prescribed by section 1563.24 of the Revised Code. This report shall be posted on a blackboard provided for that purpose at the main entrance to the mine. This section does not apply to the mine superintendent and mine foreman.

No person shall refuse or neglect to comply with this section.