Ohio Rev. Code § 737.10
In case of riot or other like emergency, the mayor may appoint additional patrolmen and officers for temporary service in the police department, or additional firemen and officers for temporary service in the fire department, who need not be in the classified list of such department. Such additional persons shall be employed only for the time during which the emergency exists.
The mayor may call upon the sheriff of the county in which all or part of the municipal corporation lies or the sheriff of any adjoining county, the mayor or other chief executive of any municipal corporation in the same or any adjoining county, and the chairman of the board of township trustees of any township in the same or any adjoining county, to furnish such law enforcement or fire protection personnel, or both, together with appropriate equipment and apparatus, as may be necessary to preserve the public peace and protect persons and property in the requesting municipal corporation in the event of riot. Such aid shall be furnished to the mayor requesting it, insofar as possible without withdrawing from the political subdivision furnishing such aid the minimum police and fire protection appearing necessary under the circumstances. In such case, law enforcement and fire protection personnel acting outside the territory of their regular employment shall be considered as performing services within the territory of their regular employment for purposes of compensation, pension or indemnity fund rights, workers' compensation, and other rights or benefits to which they may be entitled as incidents of their regular employment. The municipal corporation receiving such aid shall reimburse the political subdivision furnishing it the cost of furnishing such aid, including compensation of personnel, expenses incurred by reason of the injury or death of any such personnel while rendering such aid, expenses of furnishing equipment and apparatus, compensation for damage to or loss of equipment or apparatus while in service outside the territory of its regular use, and such other reasonable expenses as may be incurred by any such political subdivision in furnishing such aid. Nothing in this section shall be construed as superseding or modifying in any way any provision of a contract entered into pursuant to section 737.04 of the Revised Code. Law enforcement officers acting pursuant to this section outside the territory of their regular employment have the same authority to enforce the law as when acting within the territory of their regular employment.
R.C. §737.10