Tint regulation does apply to non-Alaska registered vehicles. No mirrored tint is allowed. Tint shops are not allowed to tint cars beyond state law. The Windshield can have a tint strip at the top. The amount is determined by a complex formula as defined in Sec 14-99g, Subsection C, part 11 as written by an East Coast lawyer.
Mirrored tint is illegal.
Medical exemption ia available. Cars before 1982 model year are exempt from IL tint law. Darker tint is allowed for medical reason only as attested to by medical doctor or eye doctor. Law enforcement usually enforces the tint law on the front side windows. Most law enforcement do not know that the rear-back window is included in the law.