Yeah. In lower grades in Germany you'd raise a hand or just get up and leave, depending on the policy of your teacher. As students turn 16-18 nobody cares about

Yeah. In lower grades in Germany you'd raise a hand or just get up and leave, depending on the policy of your teacher. As students turn 16-18 nobody cares about where they go anymore. At that point school becomes optional and students are there because they want to, not because they have to. Controlling their bathroom breaks would be ridiculous. At university level nobody is checking attendance anyways. You go to classes/lectures if you think you need them. There's no points awarded for the mere fact that you showed up or for anything occurring in the course of them. Here controlling bathroom breaks would be beyond farcical.