rubber room
n.— «He cites the process in New York city, where the best they can do with teachers that are incompetent, violent or sex offenders is to put them in what is called a “rubber room,” a segregated space where they do no work all day while still getting full pay because the process for dismissal takes years.» —“Do not believe everything that you’re told” by John Christie Kennebec Journal (Augusta, Maine) July 2, 2006. (source: Double-Tongued Dictionary)