Ohio Rev. Code § 3796.29
The legislative authority of a municipal corporation may adopt an ordinance, or a board of township trustees may adopt a resolution, to prohibit, or limit the number of, cultivators, processors, or retail dispensaries licensed under this chapter within the municipal corporation or within the unincorporated territory of the township, respectively.
This section does not authorize the legislative authority of a municipal corporation or a board of township trustees to adopt an ordinance or resolution limiting research related to marijuana conducted at a state university, academic medical center, or private research and development organization as part of a research protocol approved by an institutional review board or equivalent entity.
R.C. § 3796.29