BLOOD ANALYSIS

BLOOD AT THE CRIME SCENE

Large spots - the blood was travelling at a relatively low velocity Small spots - the blood was travelling at a relatively high velocity. (More force equals smaller splatter) Elongated drops - victim was moving, their speed relative to the amount the spots are stretched and how far they are spaced apart. (Also indicates directionality) Void in otherwise uniform splatter - something blocked the blood spray. Contact - large stain on a surface caused by contact with a bloody object. Cast-off - straight, elongated lines of splatter indicating that blood was thrown by a moving object in a change of direction. (Can show how many times a victim was struck) video

Neither anti-A or anti-B Blood Typing Karl Landsteiner in 1901 Blood type: Antigens on red cells: Antibodies in serum: A Anti-B B Anti-A AB Neither anti-A or anti-B O Neither A nor B Both anti-A and anti-B O A B AB 43-45% 40-42% 10-12% 3-5% O+ 39% O- 6% A+ 35% A- 5% B+ 8% B- 2% AB+ 4% AB- 1%