Ohio Rev. Code § 3723.03
Pursuant to division (B) of section 3723.02 of the Revised Code, an individual, business entity, or government entity that holds a valid license issued by another state authorizing practice as a radon tester, mitigation specialist, or mitigation contractor under the laws of that state may practice in this state without a license issued under this chapter for not more than ninety days in any calendar year as a radon tester, mitigation specialist, or mitigation contractor, if the director of health finds that the requirements for licensure in that state are comparable to the requirements for licensure under this chapter and the rules adopted under it and the individual, business entity, or government entity provides notice to the director of health, in accordance with rules adopted under section 3723.09 of the Revised Code, prior to commencing practice in this state. Chapter 4796. of the Revised Code does not apply to a nonresident individual authorized to practice under this section.
R.C. § 3723.03