Forensic scientists use blood and blood splatter patterns to help solve crimes,especially violent ones.
Types of Blood Stain patterns 
There a lots of different types of blood splatters. These are:                      

- Low-velocity blood splatter
- Medium-velocity blood splatter
- High-velocity blood splatter
- Cast-off stains 
- Shadowing/Ghosting 
- Swipes and Wipes 
- Expiratory Blood 
- Transfer Patterns 
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