During a forensic autopsy of a homicide victim with multiple stab wounds, the pathologist observes that the majority of wounds are clean, linear, with sharp edges and minimal tissue bridging. Which of the following is the most common type of weapon used to inflict such stab wounds?

Explanation

## Most Common Weapon in Stab Wounds **Key Point:** The kitchen knife (single-edged blade) is the most common weapon used to inflict stab wounds in homicidal cases, accounting for 60–70% of all stabbing incidents in forensic practice. ### Characteristics of Stab Wounds from Kitchen Knives 1. **Clean, linear edges** — Single-edged blades produce sharp, well-demarcated wound margins with minimal tissue bridging. 2. **Accessibility** — Kitchen knives are readily available in most households, making them the weapon of opportunity in domestic violence and spontaneous assaults. 3. **Ease of use** — No special skill is required to inflict a stab wound with a kitchen knife. 4. **Forensic appearance** — The wound tract is relatively uniform in depth and width, reflecting the blade dimensions. ### Wound Characteristics by Weapon Type | Weapon Type | Edge Characteristics | Wound Appearance | Frequency (%) | |-------------|----------------------|------------------|---------------| | Kitchen knife (single-edged) | Sharp, linear | Clean edges, minimal bridging | 60–70 | | Broken glass | Irregular, jagged | Ragged edges, tissue bridging | 10–15 | | Screwdriver | Pointed, cylindrical | Small entry, minimal bleeding | 10–15 | | Serrated blade | Multiple small teeth | Irregular, shredded margins | 5–10 | **High-Yield:** Kitchen knives are the most common weapon in stab wounds because they are ubiquitous, easy to use, and produce characteristic clean-edged wounds. This is a frequently tested fact in forensic medicine exams. **Mnemonic:** **KNIFE** = **K**itchen knife (most common), **N**eeded (pointed tools), **I**rregular (glass), **F**orensic (appearance varies), **E**dge (type determines wound margin). **Clinical Pearl:** In forensic examination, the width and depth of the stab wound can help estimate the blade width and length. A single-edged kitchen knife typically produces a wound with one sharp edge and one blunt edge, which is diagnostically useful. **Warning:** Do not assume that a serrated blade was used just because the wound edges appear slightly irregular — tissue retraction and postmortem artifact can mimic serration. Examine the wound tract carefully under magnification.