(1) stretching of skin over point on insertion and subsequent recoil on withdrawal.(2) tapered blade not fully insertedWound length > blade width when blade does not pass straight in and out - entry and withdrawal at angle."Rocking" of knife on withdrawal. Cutting edge extends wound length The best indicator of blade width is the shortest (least rocking), deepest wound (weapon fully inserted)SHAPE OF WOUND May indicate:(1)Cross-sectional shape of knife blade e.g. - Double-edged blade --> Slit with two sharp endsN.B. single edged knife may give similar wound due to clean splitting over blunt end- Thin, single edge blade --> Triangular slit, one sharp end- Thick, single-edged blade --> Slit with one sharp and one 'fishtail' end due to stretching & laceration over blunt edgeStab wounds are typically elliptical with clean cut edges and no bruising or abrasion of margins (incision)(2) Direction of insertion overhang of upper edge, bevel of lower edge N.B. The direction of the wound track through the tissues is assessed at post mortem, with the body lying flat on its back. The position of the internal organs is different in life, when standing, sitting and breathing.(3) Movement of instrument on withdrawalSmall change in angle --> notch Twisting --> crescentic woundWOUND TRACK DEPTH< length of instrument if not fully inserted
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