Federal officials said Argenbright continued to inadequately check employees' backgrounds, some of whom worked at Dulles. The company responded by saying the audits occurred before it implemented its new compliance program for more-thorough checks. Further concerns were expressed by the Maryland Aviation Administration, which manages BWI. Beverley Swaim-Staley, the administration's acting executive director, wrote a letter to Southwest Airlines' corporate managers asking for assurances Argenbright would not repeat mistakes discovered by federal investigators. "Obviously, Southwest Airlines needs to decide who they want to hire as their security screening company," Mrs. Swaim-Staley wrote.