1. Chemistry Unit, FBI Laboratory, Federal Bureau of Investigation, Washington, D.C. 20535, US.
2. Dade County Medical Examiner Dept., Miami, Florida 33136, US.
3. Chemical Toxicology Institute, Foster City, California 94404, US.
4. National Institute of Drug Abuse, Baltimore, Maryland 21224, US.
5. Cameron, Montana 59720, US.
6. Food and Drug Administration, Cincinnati, Ohio 45202, US.
7. Cuyahoga County Coroner's Office, Cleveland, Ohio 44106, US.
8. University of Toronto, Toronto, Ontario and The Centre of Forensic Sciences, Toronto, Ontario M7A 2G8, US.
9. University of Illinois at Chicago, Chicago, Illinois 60612, US.
10. Medical College of Virginia, Richmond, Virginia 23298, US.
11. University of Miami, Miami, Florida 33177, US.
12. National Medical Services, Willow Grove, Pennsylvania 19090, US.
13. Virginia Division of Forensic Science, Richmond, Virginia 23219, US.