What characterizes high-velocity impact spatter (HVIS)?

High-velocity impact spatter (HVIS) is characterized by a mist-like dispersion formed upon impact. This type of spatter occurs when blood is subjected to a significant force, resulting in the blood being fragmented into small droplets that can travel considerable distances. The fine mist appearance results from the high-speed impact that causes the liquid to break up, producing droplets that are typically less than 1 mm in diameter.

This distinction is important in forensic investigations, as it can help professionals determine the type of force involved in a violent incident. The formation of a mist-like pattern often indicates a high-energy event, such as a gunshot or a high-speed blow, rather than a lower-energy situation. This characteristic of HVIS is essential for crime scene reconstruction and understanding the dynamics of the event being investigated.