I've been driving since 1958 and never been stopped for a window tint check.....till Utah state trooper got me on I-80 through Park City.....twice.
First time was in 2015 in the wifes 2010 Impala with a tint strip at the top of the wind shield. Trooper was nice and says why he stopped me. Had a look to see if the tint extended below the AS-1 line marks on the wind shield.
Second time was in the same exact spot on I-80/Park City...different trooper. We were in the wifes new 2016 1500 chevy with my states legal tint on the drivers/passengers window.
Both times they checked the tint with some type of pockets measuring device.
No tickets and trooper says have fun while your in Utah.