Did People Tint Windows in mid - late 70s?

I bought a Chevy van brand new in 1974 and 2 weeks later I went to
Ft. Meyers, Florida with my girlfriend.
In Sarasota I saw a window tint shop and had my front door windows lightly tinted and had chrome tint put on my sliding door and back doors.
Cops in Ohio tried to bust me for the chrome tint, stating that they could not see into the van, so I opened the door and all they saw was black cutains in the windows.
They still tried to write me up until I asked them why bust me when there are a lot of vans runnin' around with NO windows in the doors.

As a side note, if I pulled the curtain behind the front seats, I could park it anywhere and have a 'good time' with my girlfriend and nobody was the wiser. Maybe that is why all my friends wanted to borrow it on Friday and Saturday nights. Got to drive a bunch of cool cars those nights.

70 GS 4555 Stage1 4sp convert Root Beer Met Brown
70 429 Cyclone Spoiler Grabber Green 4 sp
65 Fury 426 Street Wedge all black

Those were the days.