Ohio Rev. Code Ann. § 2967.193
(A)
(2) Unless a person is serving a mandatory prison term or a prison term for an offense of violence or a sexually oriented offense, and notwithstanding the maximum aggregate total specified in division (A)(3) of this section, a person who successfully completes any of the following shall earn ninety days of credit toward satisfaction of the person's stated prison term or a ten per cent reduction of the person's stated prison term, whichever is less:
(C) No person confined in a state correctional institution or placed in a substance use disorder treatment program to whom any of the following applies shall be awarded any days of credit under division (A) of this section:
(D) This division does not apply to a determination of whether a person confined in a state correctional institution or placed in a substance use disorder treatment program may earn any days of credit under division (A) of this section for successful completion of a second program or activity. The determination of whether a person confined in a state correctional institution may earn one day of credit or five days of credit under division (A) of this section for each completed month during which the person productively participates in a program or activity specified under that division shall be made in accordance with the following:
(1) The offender may earn one day of credit under division (A) of this section, except as provided in division (C) of this section, if the most serious offense for which the offender is confined is any of the following that is a felony of the first or second degree:
(F) As used in this section: