What is 'blood-stain convergence' and how is it studied in CSI?

What is 'blood-stain convergence' and how is it studied in CSI?

Richard Saferstein (Former Chief Forensic Scientist) gives expert video advice on: What is blood made of?; How does the classification of blood type help in CSI?; Why are blood stains studied in CSI? and more...

Blood-stain convergence is a form of blood-stain pattern analysis, and it allows us to make a determination as to the origin of a stain pattern. Often at crime scenes when there is bleeding, there is a lot of movement; movement on the part of the perpetrator, perhaps even movement on the part of the victim. The convergence protocol procedure allows the blood-stain pattern analyst to ascertain the point of origin or area of origin of a series of blood-stains.