Put on tint.
Get pulled over (hopefully) a while later
Police demand you remove it and usually write you a ticket for ~50 eur
Maybe you plead that the car is your dad's if it's not registered to you and get to keep the tint if they decide to do you a favor
Otherwise you remove it and go pay another X eur a week later to have new one put on
Since there's no license point deduction, it's just a money/inconvenience issue.
https://www.bbc.co.uk/news/articles/c51y927e5g2o