PC Nolan replied: "I believed what I saw was a smear of blood on his thumb." The witness told jurors he then called for evidence bags to put over the handcuffed suspect's hands before he was put ...

THICK blood smears (5–10 µl./cm. 2) can be grouped in the ABO blood group system by an absorptionelution technique which has been evolved in this Laboratory over the past two years.