◆ SpookStack

v (Rev! 01-31-2003) . e@ @ FEDERAL BUREAU OF INVESTIGATION Precedence: ROUTINE Date: 05/20/2004 To: Washington Field - Attn: IIc SSA SA From: Washington Field ‘AMX-3 Contact: ALL INFORMATION CONTAINED Approved By: Ld HEREIN IS UNCLASSIFIED : DATE 12-17-2008 BY 60324 UC BAU/DK/TH Case ID #: 279A-WF-222936-USAMRIID~ (Pending) WOW Title: AMERITHRAX; MAJOR CASE 184 Synopsis: To provide results of AMX-3 investigative project to determine potential windows of opportunity for access to post- challenge Ames from the Aerobiology Division of USAMRIID. key Card access ing post-challenge windows i ‘ ; bé of opportunity, potentially pertinent = pyc challenge after-hours key card-access records, and Building] after-hours main entrance key card access records for indivi essing those locations immediately before and Details: Data from aerosol challenges involving Bacillus anthracis (Ba) for the time period August 1998 to September 1999 was analyzed to determine potential windows of opportunity for removal of post-challenge Ames during a ten-day period following each aerosol challenge. It was estimated based on spore . concentrations of material used that any aerosol challenge involving greater than or equal to three animals would constitute enough available Ba to have assembled the anthrax-laced letters. All Ames challenges in the time period for which key card access records are available involved at least three animals. In an interview a September 10, 2003, el indicated that, following Ba Challenges, the agar plates b2 tored in refri rs in Buildin and ina bIP from Building (Special Agent (SA) believes