Answer: the blood belongs to my suspect who has type B blood.
Step-by-step explanation:
In 1900, Karl Landsteiner convincingly demonstrated that there were individual differences between the plasma membrane of the red cells of normal individuals. These differences has been a useful tool in the field of forensic science.
Landsteiner showed the presence of one of two antigens ( either A or B or neither, which was later called O) on the red cells of each individual. He also discovered that the serum from such individuals contained different antibodies. Example:
Blood group A contained antibody B
Blood group B contained antibody A
Blood group O contained antibody A and antibody B.
Blood group AB contained no antibody.
From the above discovery by Landsteiner, the blood analysed from the crime scene belongs to my suspect who has type B blood.