What is bloodstain pattern analysis (BPA)?
Bloodstain pattern analysis, (also referred to as blood spatter analysis and blood splatter analysis) is an in depth evaluation of the bloodstain patterns found in a given scene. To reach a conclusion the analyst considers a number of factors related to each pattern, including but not limited to: number, dispersion, shape, size, volume, orientation, and location. The product of this analysis are defined events that occurred during the incident; that is the bloodstain pattern defines the basic nature of the action that created it.