Note: At the 2009 IABPA meeting in Portland, OR, USA, the IABPA membership voted to adopt the SWGSTAIN recommended terminology.
- Medium Velocity Impact Spatter (MVIS)
- A bloodstain pattern caused by a medium velocity impact/force to a blood source. A beating typically causes this type of spatter.
Special Note: The concept of low, medium, and high velocity spatter is no longer recognized as valid by the bloodstain community. This is an impact pattern.
This pattern was generated by placing a small volume of blood on a hard surface and striking it with a rubber mallet.
Medium velocity impact spatter (MVIS) is generally produced by objects travelling between 1.5 m/s and 7.5 m/s. The majority of stains in this pattern are between 1 mm and 3 mm in diameter. This type of pattern is most often associated with blunt force trauma or cutting/stabbing actions.