I picked the Norms Note's blog repost of the article rather than the Financial Times because the headline was more catchy.
Excerpt:
When I began teaching in New York City 37 years ago, if you were reported for serious misconduct, you were sent to a Board of Education office until the matter was resolved. But as the system grew, removing teachers from the classroom became standard for even the most trivial offence. The board’s offices got so crowded they began leasing buildings around the city to use as “reassignment centres”, nicknamed “rubber rooms”.
As many as 800 to 1,000 teachers are in rubber rooms on any given day; it’s an academic Guantánamo Bay. Many go stir-crazy. Brooklyn’s Chapel Street rubber room is huge but so crowded that people are almost falling out of the windows.
When I was first sent to one of these rubber rooms, it took me six months to establish what the complaints were. Meanwhile, like everyone else, I turned up every day, kept the same hours and received my salary. But there was nothing to do except wait. It’s known as constructive termination.
In the worst rubber rooms, there are people who’ve been there for up to five years.
Norm's Notes