| Term | Definition |
|---|
| Tool Marks | a scratch or other micrscopic marking left by an action of a tool on an obect |
| Statistics of Crimes Dealing with Firearms | 2002 ATF reported 80,000 weapons sold ilegally in the United States; 2000 people were charged with selling guns illegally; 250,000 firearms related crime committed each year |
| Gauge | refers to the number of pellets weighing 1 pound that would have the same diameter as barrel if grouped in a circular pattern |
| Caliber | size of rifled firearms; describes size of a particular catridge |
| Propellants | black powder created by the Chinses in the 10th century |
| Mixture | charcoal, sulfur, and salt pepper |
| Types of smokeless powder | single and double base |
| Types of bullets | lead or lead alloy; fully jacketed; half-jacketed bullets |
| Two types of pistols | self-loading, revolvers |
| Ballistics | firearms examinations |
| Drugfire | FBI began in 1992, a database of fingerprint primer impressions on spent catridges recovered from crime scene |
| National Integrated Ballistic Information Network | Allows searching of bulllets and catridges using the same computer system |
| Gun Shot Residue and determination of distance of shot | hot gases and powder discharged from a firearm when a bullet is discharged; depending on distance, approximate distance between weapon and target may be approximately the size of GSSR pattern, usually only going 18 inches |
| Crime scene Processing | firearms evidence must be clearly documented and photographed; portions of walls and items containing cartridges should be removed; care must be take not to mark and deface bullets or cartridges when collecting them; weapons should never be marked in places where evidence may exist |
| Class Characteristics of Bullets | caliber, number of lands and grooves, their angle and direction of twist |
| Individual Characteristics of Bullets | matching stria |
| IBIS | Integrated Ballistics Identification System |
Combine with other sets
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