Who knows, why should they feel obligated to supply any kind of rationale for their actions? [edit: /s]Here is the sum total of detail they have provided: “ All researchers must apply and present a researcher card, which may be obtained in Room 1000. This ensures that proper identification is on file for all individuals accessing the building to establish a legitimate business purpose. Abuse of any researcher registration to circumvent access by the general public may result in a trespass situation and a permanent ban from access to all NARA facilities.”