 Bill Buchanan is sent to CTU to help oversee operations during Day 4, particularly the Jack Bauer-Behrooz Araz trade off, an idea that Buchanan had initially disagreed with.When he realizes that there are no viable alternatives, Buchanan decides to proceed with the exchange.Following the destruction of the trackers on Behrooz, Jack informs Buchanan that he was able to short circuit some wires where he had been detained.