- 01: Introduction
- 02: History
- 03: Propellants, Firearms, and Ammunition Development
- 04: Modern Firearms Manufacture
- 05: Small Arms Ammunition
- 06: Evidence Handling Procedures
- 07: Equipment and Instrumentation
- 08: Examination of Firearms
- 09: Cartridge and Shotshell Examination
- 10: Characterization and Evaluation of Fired Projectiles
- 11: Bullet Comparison and Identification
- 12: Gunshot Residue and Distance Determination
- Introduction
- Objectives
- AFTE Knowledge and Ability Factors
- Powders and Residues
- Examination
- Distance Determination
- Significance of Results
- Contact Shot
- Nitrite Residues
- Vaporous Lead Residues
- Residues Consistent with the Passage of a Bullet
- Residues Consistent with the Discharge of a Firearm
- Interpretation Challenges
- Reproduction of Results
- Nitrite Residue Patterns
- Shot Patterning
- Chemical Testing
- Shot Pattern Reproduction
- Selected Bibliography
- 13: Toolmark Identification
- 14: Communicating Results
- Resources
Module 12: Gunshot Residue and Distance Determination
Home > Gunshot Residue and Distance Determination
| Author: John H. Dillon, Jr. |
 Jack
Dillon earned a B. S. from the United States Naval Academy and an
M. Ed. from the University of Virginia. Commissioned in the United
States Marine Corps in 1964, he attained the rank of Captain of Marines.
Appointed a Special Agent, FBI, in 1970, he investigated diverse criminal
violations, including organized crime, bank robberies, extortions,
and kidnappings. In 1976 he received orders to the Firearms/Toolmarks
Unit of the FBI Laboratory for training as an examiner, where he evaluated
evidence and provided on-site field support in domestic cases, as
well as abroad. He also designed and taught basic and management-level
forensic courses at the FBI Academy, Quantico, Virginia, 1982-1988.
Jack retired from the FBI as Chief of the Firearms/Toolmarks Unit
in 1994, and continues to consult in forensic firearm cases and in
training design and delivery. |
