[Sleaker]

You also can't have double-blind study on something both the participant and teacher know is present or not.... But that doesn't mean the study is invalid, it just means you have to account for it.

[rileymat2]

That’s interesting, what if they don’t know it is an experiment or that any study is being done?

School A bans them, school B does not. None of the teachers know a study is being done.