I was looking around on my commute this week. Seems every third car has tint up front. Five-O wants a new hobby it will be a long time before they get around to me.
I just bought a roll of 85% absorbent, 15% transmissive (sorry, I'm an ex spacecraft thermal engineer, we're particular about material optical properties) electrostatic film. Its 5% darker than the Cali law allows in the rear, but if Five-O wants 'em off I can peel 'em off while the officer watches...and stick 'em back on when he leaves. It gloms to curved windows way easier than tint film too, especially around the back window. Costs me ~$3 a foot at Tap Plastics. No spray, no squeegie, no pain-in-the-rear required.