Today blood types do not help forensic scientists. It used to but when DNA anaylas came along in the 1980's it wasn't needed. Karl Landsteiner won the nobel prize for his discovery of blood type in 1901.
These are the different blood types.
Blood stains are needed in CSI to get the DNA composition of the blood. Another reason is blood stains leave a pattern and this can be very important in a crime scene as to what happened. For example how many blows someone had and in what direction. What movement the victim had during the crime.
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