- Accelerant
- Accident Investigations at Sea
- Accident Reconstruction
- Adipocere
- Aflatoxin
- African Lemba Tribe
- Air and Water Purity
- Air and Water Purity, Forensic Tests
- Air Force Criminal and Forensic Investigations
- Air Plume and Chemical Analysis
- Airbag Residues
- Aircraft Accident Investigations
- Alternate Light Source Analysis
- American Academy of Forensic Sciences
- Amphetamines
- Analytical Instrumentation
- Anatomical Nomenclature
- Ancient Cases and Mysteries
- Animal Evidence
- Animation
- Antemortem Injuries
- Anthrax
- Anthrax, Investigation of 2001 Murders
- Anthropology
- Anthropometry
- Antibiotics
- Antibody
- Antigen
- Archaeology
- Architecture and Structural Analysis
- Arson
- Art Forgery
- Art Identification
- Artificial Fibers
- Ashbaugh, David Robinson
- Aspermia
- Asphyxiation (Signs Of)
- Assassination
- Assassination Weapons, Biochemical
- Assassination Weapons, Mechanical
- ATF (United States Bureau of Alcohol, Tobacco, and Firearms)
- Automated Fingerprint Identification System (AFIS)
- Automobile Accidents
- Autopsy
- Autorad
- Aviation Security Screeners, United States
- Bacteria, Classification
- Bacteria, Growth and Reproduction
- Bacterial Biology
- Bacterial Resistance and Response to Antibacterial Agents
