yep, tints were mainly used by the old mafia dons, using limo black tints on every piece of window there is!
there inside view was perfect clear like there is no tint paper attached.
old classic cars not sure from what age, are still allowed tints of which ever shade..
as for us lot we are only allowed from the centre pillar backwards of any shade.
have done window tinting 2 years at a company and use to also get people who wanted front screens but they never tinted the sides.
I see a lot of people today with tinted front screens, its a different ball game altogether and think looks fantastic!