I'm concerned with the "in Ohio, first time OWI offenders are required to stay in jail 3 days"... Like, post-conviction? Or are they punishing before convictio

I'm concerned with the "in Ohio, first time OWI offenders are required to stay in jail 3 days"... Like, post-conviction? Or are they punishing before conviction here? It's sort of fucked, considering that there are several medical conditions commonly mistaken for drunk driving.