CHE 107 Lecture Notes - Lecture 24: Forensic Science, Sole Markings, Rifling

• School: Pace University
• Department: Chemistry
• Course: CHE 107
• Professor: Richardson

Document Summary

Collected by: holding weapon by the edge of the trigger guard, checkered portions of the grip. Before being sent to lab, all precautions must be taken to prevent accidental discharge of a loaded weapon. Evidence must be marked for identification: usually a tag on the trigger guard. Investigator must protect bullet by wrapping it in tissue paper. &placing it in a pillbox/envelope for shipment to crime lab. Criminalist is requested to restore serial number when it"s been removed/obliterated by grinding, rifling, or punching. Restoration of serial numbers is possible through chemical etching: metal crystals in stamped zone are placed under permanent strain that extends short distance beneath original numbers, tool marks: Any impression, cut, gouge, or abrasion caused by a tool coming into contact w/ another object. Careful examination of the impression can reveal important class characteristics, such as: size of tool, shape of tool.