It's possibly the best lesson they will learn all year. How to challenge authority when it is wrong - by which I mean inflexible, unfair and disproportionate. If everyone took this view, we may get a better society.
As an aside, my 18 YO schooleaver son went to work for the first time today, on a building site. I hope it lives up to his expectations and I did warn him. "Dad, it can't be any worse than school" was his response.
I hope Mum will have the Radox ready for him

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Didn't need the Radox, he managed to leave all of the filth over the inside of my car

He did have the time of his life and said the 9 hours flew by. Currently fashioning a car seat cover out of bin liners. Talking of which - and also more on topic - I once wore a bin liner to a school art exhibition for a bet.