 When Bauer escapes custody with the aid of Buchanan and Audrey, McGill becomes suspicious that he may have had help from CTU, and Buchanan is detained for insubordination, but was later reinstated when McGill was relieved of duty.Homeland Security is ordered to absorb CTU; and when Raines discredits Buchanan to reinstate O'Brian, Buchanan is relieved of duty.O'Brian is discovered working with Jack at Bill Buchanan's home by the CTU; but, a tipoff from Karen Hayes enables Chloe to escape, and Buchanan is arrested without incident.