Unusual results due to transfused blood

During a murder enquiry, the forensic science investigation used PGM and EA P blood grouping systems and detected a mixture of blood on the deceased's jacket. The blood groups matched those of the deceased and accused. The res ults of DNA analysis, however, proved that only a single source of DNA, mat ching the deceased, was present. Supplementary information relating to the transfusion of the individual whilst still wearing his clothing led the aut hors to conclude that a mixture of transfused blood and the individual's ow n blood had effused from his body via a stab wound, and onto his clothing.