What diameter of blood stains is typically associated with medium-velocity impact spatter (MVIS)?

Medium-velocity impact spatter (MVIS) typically produces blood stains that range from 1 to 3 mm in diameter. This size range is indicative of the energy and mechanism involved in the impact that caused the spatter. MVIS often results from intentional or unintentional actions such as blunt force trauma, where the force applied is sufficient to propel blood in a dispersed manner but not so forceful as to create large droplets.

Understanding the size of the stains is crucial for crime scene investigations as it helps forensic experts determine the nature of the incident. If the stains were smaller than 1 mm, they would typically be associated with high-velocity impact spatter, which is caused by more significant forces, such as gunshot wounds. Conversely, stains greater than 3 mm are indicative of low-velocity spatter, which occurs under different circumstances, such as passive bleeding or dripping. Thus, 1 to 3 mm is the correct range associated with medium-velocity impact spatter due to the typical forces involved in such scenarios.