I have never seen it myself, but I know of at least one person that was kicked back to the BU during their probation period. I think it shocked no one who knew him. On a side note, I also know of a supe who bid a permanent job, made the transfer out of state and trained for a few weeks, but then was approved to transfer back to the controller ranks at his old facility. (I think it was an easy sell, since his old facility was understaffed). His wife unexpectedly landed a great job opportunity, so the situation changed overnight. He lost his seniority and was stuck on Tue/Wed until he retired a couple years later. Pretty nice guy and he said going back to the BU was "the best move of his career," in spite of getting crappy RDOs.