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To: Washington ©. From: Washington Field Re: 279A-WF-222936-USAMRIID, 03/29/2006 Anomalies indicate that the employee may have piggybacked through a missing access point with another individual, or the system might not have read a keycard swipe or keypad code properly. "IN and OUT with no KEY" is most likely an anomaly if there is a significant time lapse (i.e. several minutes) between IN and OUT. The amount of anomalies evident on the spreadsheet imply that there were most likely instances of piggybacking and/or system faults through use of the change rooms_into the ack of KEY access points for entered the containment area through one of the abovementioned means. Additional review and interviews could be done to determine how many of the above individuals may have piggybacked or experienced keycard system faults when entering and exiting the containment area. Individuals whose keycard records show anomalies or no access points at all could be further investigated, and a study could be done of the history of failures of the keycard access system. The initiatives described above demonstrate a significant difference between expected keycard access data for employees using the containment area of Building 1412, and the actual data for employees during several Ba aerosol challenges between 9/1998 and 8/2001. The records of these employees often did not include at least one access point that is required for entering or exiting the containment area. The initiatives therefore have demonstrated that it is likely employees involved in aerosol challenges have piggybacked and/or experienced system failures when using keycard access badges and keycard access codes. All records in one initiative did show at least some indication of the use of a change room, however; it is therefore unlikely that an individual who worked in the containment area during an aerosol challenge would have access records that show no access at all to one of the change rooms. +4