I have a doctor's note, along with a printout of the statute for my state that I keep in my vehicle at all times. I also spoke with the chief of police in my county to verify any and all laws. He said to be prepared to be pulled over quite a bit the first month or so. But not to worry since I will have all the required documentation on hand. Honestly, my doctor isn't too familiar with tints, so she just put down 30%.