To secure a window tint exemption in Ohio, you'll need a physician's affidavit stating your medical necessity. In most cases, you will need to fill out a vehicle tint-waiver request form — or some form along those lines — depending on where you reside.Find out if you Qualify for a legal tint exemption in less than 5minutes. It is free to find out if you qualify! Concerning car window tinting laws in the state of Ohio, you're allowed any level of darkness for backseat side windows and rear windows.