Making it difficult for kids to slide out during lessons using toilet breaks as an excuse, probably. And in the process, making life difficult for students with IBS and other conditions and every. single. young. woman. who menstruates.
Not on! When I taught secondary, every girl in my class who asked to go, went. No fuss, no delay, no questions. Think of the alternative for just a moment...
The boys sometimes got stroppy: "Miss, you let the girls go!" Yes I do, sunshine. Get over it. Not up for discussion.
With pre-pubescent children it's often a case of not wanting to go at playtime because they'd rather play, and then they need to go later, on lessons. I lined them up and made them visit the toilet before I let them out for play or lunch. I inspected their hands to see they'd washed them, too. Teachers can't do those things once children are in double figures!
If a boy, or a girl for that matter, had a medical issue, fine, of course. Parents would tell me directly and I was discreet. And frankly, you can tell at a glance if it's a genuine request, just from the child's face. No fuss. No problem.
But all this prisoner and escort stuff? Tosh. It won't last five minutes. Those deputies have other, more important work to do! Whoever dreamed up this scheme is making a point but will be wildly unpopular with the entire staff.