If you are flying in or out of a U.S. airport this summer you may notice Transportation Security Officers (TSOs) conducting random additional screening at airline gates. The screening, part of TSA's Aviation Direct Access Screening Program (ADASP), can include passenger identification and boarding pass checks, physical searches of carry-on luggage, and handheld explosive detection wanding.. These checks are not announced in advance and can occur at any gate, at any time. Behavior Detection Officers (BDOs) will accompany the TSOs during some of the screening activities to provide an additional layer of security. BDOs screen travelers for involuntary physical and physiological reactions that indicate stress, fear or deception.