Macroscopic characteristics of screwdriver trauma

Area of Science:

• Forensic Science
• Biomechanics
• Skeletal Trauma Analysis

Background:

• Screwdrivers are common household tools that can be used as weapons.
• Understanding the specific patterns of skeletal trauma caused by different screwdriver types is crucial for forensic investigations.

Purpose of the Study:

• To determine the macroscopic trauma patterns produced by flat-tipped and cross-tipped screwdrivers.
• To assess whether these distinct trauma patterns can be macroscopically differentiated.

Main Methods:

• Three experimental tests were conducted using fleshed pig ribs as bone surrogates.
• Each sample received 15 stab wounds from either a flat-tipped or cross-tipped (Phillips) screwdriver.
• Wounds were inflicted at perpendicular and oblique angles, with fabric variables introduced.

Main Results:

• Macroscopic skeletal trauma was categorized into fractures and puncture wounds.
• Distinct differences in trauma characteristics and frequencies were observed between the two screwdriver types.
• The macroscopic appearance and frequency of trauma allowed for differentiation.

Conclusions:

• Flat-tipped and cross-tipped screwdrivers produce distinguishable types of macroscopic skeletal trauma.
• Macroscopic examination of bone injuries can aid in identifying the type of screwdriver used in an assault.