I read that tint is no longer metered. Its up to the officer to decide if it visible enough for him to see everyone inside.
http://codes.ohio.gov/orc/4513.241
"(A) The director of public safety, in accordance with Chapter 119. of the Revised Code, shall adopt rules governing the use of tinted glass, and the use of transparent, nontransparent, translucent, and reflectorized materials in or on motor vehicle windshields, side windows, sidewings, and rear windows that prevent a person of normal vision looking into the motor vehicle from seeing or identifying persons or objects inside the motor vehicle."