Excellent site as entry point into an explanation with illustrations.
Serology : it’s in the blood
The history of the development of forensic blood analysis and its use in criminal cases.
What Is Forensic Serology?
Online article from eHow.com
Article from Forensic-Medicine.info
Forensic serology - Blood
Slideshare presentation. Check accuracy of information against a ferified source
Blood may be gross, sticky and smelly, but it one of the best methods of solving crimes, where there are no suspects, but there is blood reminisce on a surface.
Blood serology 1
The Thin Blue Line [NSW Police]. False identification and blood groups
Blood serology 2
Probably one of the most famous or infamous cases in which blood stains played a key role was that of Azaria Chamberlain.
Blood serology 3
The Thin Blue Line [NSW Police]. Blood stain pattern analysis
Bloodstain Pattern Analysis in Action: The Chamberlain Case
How blood stain pattern analysis works
TV Report about the science of Blood Spatter Analysis.
The CSA in the story, Daniel Holstein, is the Real Life basis for the "CSI: Crime Scene Investigation" character Gil Grissom