http://www.forensicpathologyonline.com/E-Book/injuries
Scene
An assault with a clubbing instrument may take place in almost any locality either in the outdoors or indoors. When it occurs indoors in a confined space, the injuries may be modified by the limitation of movement imposed upon the assailant. The amount of disorder at the scene will depend upon whether the victim was taken unawares and rendered unconscious i.e. incapable of defending himself or whether he has been able to make a determined effort to protect himself. In the letter case great disorder may be found. Of the findings at the scene of this kind the widespread distribution of blood in the forms of spurts, smears and pools is the most significant feature.
If only on blow has been struck, even though an extensive laceration has* been inflicted, no blood may be projected from the wound because the leading edge of the instrument as it strikes the body expels blood from the tissue beneath it. the instrument itself may not even be blood stained. Any subsequent blows will force blood under considerable pressure through the torn vessels in the wound previously inflicted and this blood may be projected many feet in all directions, striking the walls, furniture, ceiling and of course the assailant. At the scene one may find blood as spurts or projected droplets from arterial bleeding or repeated blows to the body. Smears may be found where the injured person has brushed against the wall or other object. After the first laceration has been inflicted, the striking edge for a considerable distance behind, above or to the side of the assailant depending upon how he is using the instrument. The examination of collections or pools of blood may reveal where the injured person was lying and distribution of blood upon the clothing will provide valuable information as to the position of body after the injuries were received.
Any weapon found at the scene must be handled with extreme care it may have some blood or hair of the victim adherent to it and it may bear the fingerprints of the assailant. Such a print is of great importance that means the person whose blood stained fingerprint is present on the instrument, must have handled the weapon after the initial injury was inflicted.
I can't find the link but am I right in saying the baseball bat at the scene had hair and blood on it? If so according to this article it may provide the prosecution with fingerprint evidence of the last person in the room who showered the last blows to Jason.
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