I first heard this story a few months ago on This American Life, or something similar. Yes, it stinks - - but the story I heard was also quite said because many of these teachers are innocent of the charges but they don' t get a chance to defend themselves and get back to work. It drives many half insane to just sit there but if they leave it's a big black mar on their record and inhibits them from getting another job. And, some are sitting there because they disagreed with their administration (gee, you've never had a thought that diverged from your boss, no?)
So yes- I have the honor of dealing with unions issues on a regular basis and yes, this situation stinks like many of the ones I'm stuck with. Is it the person's fault sitting in a room starring out a window all day, or is it a broken system? I vote broken system.
If an employee has done something truly wrong, they should be disciplined (yep, this could include being fired) but then get on with it and NOT just just put people in a holding cell for infinity.