Surveillance systems should strictly be used for physical safety, anti-vandalism, and loss prevention purposes. You're not preparing kids to succeed by micromanaging them from behind a series of monitors. At all. People who intend to use the system to punish the kids for swearing by no means should be allowed access. The teachers and even the principal really shouldn't even have access to reduce the temptation to abuse the surveillance system. If they keep getting access the surveillance system should be thrown in the trash.

Bosses who use similar systems to keep their employees working can also expect nothing better than mediocrity and a widespread CYA mentality.