Affiliation: | Department of Biological Sciences, George Washington University, Washington, DC 20052.; Federal Bureau of Investigation, DNA Unit 2, Quantico, VA 22135.; Federal Bureau of Investigation, Chem-Bio Sciences Unit, FBI Laboratory, Quantico, VA 22135.; Federal Bureau of Investigation Academy, Counterterrorism and Forensic Science Research Unit, FBI Laboratory, Quantico, VA 22135.; Federal Bureau of Investigation, Laboratory Division, Quantico, VA 22135 |