Ohio Rev. Code § 124.43: Separate examinations and eligibility lists for police and firemen.

Separate examinations shall be given and separate eligibility lists maintained by municipal and civil service township civil service commissions for original appointments to and promotions in fire and police departments in cities and civil service townships. No person may be transferred from one list to the other. Appointments and promotions in the departments shall be only from the separate eligible lists maintained for each of the departments. Transfers of personnel from one department to the other are hereby prohibited.