Not completely true in the UK.

Any vermin that is caught must be destroyed and not let go back into the wild. That is a criminal offence.

When I trap squirrels for schools on their premises, usually roof spaces, I have to humanely destroy them whilst on the premises and still in th e catch traps.
Air rifle usually, witnessed by one of their staff.
Used to be the caretaker but they have fancy names now like maintenance manager or facilities manager.