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a Rev'01-31-2003) . @ @ FEDERAL BUREAU OF INVESTIGATION Precedence: ROUTINE Date: 05/20/2004 To: Washington Field . Attn: IIc SSA we SA bIC From: Washington Field AMX -3 ALL INFORMATION CONTAINED Approved By: [ HEREIN IS UNCLASSIFIED . DATE LE-L?-2008 BY 60924 UC BAU/DE/TH Case ID #: 279A-WF-222936-USAMRIID~ (Pending) WO?’ 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. _ Microsoft Excel spreadsheet showjng[ key Card acGess ing post-challenge windows . of opportunity, potentially pertinent = vs challenge after-hours key card.access records, and Building) : after-hours main entrance key card access records for atter| YS those locations immediately before and after . 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. Enclosures: bé In an interview of id= September 10, 2003, bICc Lara indicated that, following Ba Challenges, the agar plates b2 stored in refrigerators in Buildin and ina bUP £rom Building (Special Agent (SA) believes bé bic