By A. Gallop
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Extra info for Bloodstain Pattern Evidence
4. The length of the ellipse can be determined by using the shape of the blood drop's first contact with the surface and completing the ellipse shape as indicated. 5. One can construct a right triangle from contact lines drawn from the theoretical blood drop to the approximated ellipse (Figure 4-3). 6. Measuring the width of a stain and dividing by the length provides a number of less than Figure 4-2 Traditional technique one (<1), which can be used with a pocket calculator or log table to find the arc sin that to draw a spherical is the angle of incident for the original blood drop.
The use of areas of con- One of a variety of poses attempted in GDIS mock crime scenes. vergences alone, however, locates a general position of the origin rather than 8Wonder, Blood Dynamics, 85. 39 40 BLOODSTAIN PATTERN EVIDENCE a specific locus of points, and should not replace the formal reconstruction. Still, confirmation is always beneficial. With the excellent mathematical and physics minds working on this technique, the future will no d o u b t include u p d a t e d principles and corrections of errors in reasoning.
Bloodstain size is d e p e n d e n t upon many factors, and cannot be estimated from any assumed full-sized drop, so that it is scientifically unsound to claim size alone identifies an entire category of dynamic events. The size of a bloodspatter, also, provides information regarding that spatter, not the whole arrangement. The sizes of the associated stains within a group provide information regarding the whole pattern group if (and only if) it is first established that the group was distributed by a single event, specifically an impact.