By A. Gallop
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Additional resources for Bloodstain Pattern Evidence
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. drop making an oval 7. Using several measured stains, one can backtrack from the incident angles and locate an (elliptical) cross-sectional area containing the origin of a blood distributing impact event, A fundamental problem with contact with a surface.
The flow would have been normal if the head were positioned up with chin down. The edges of the stain on the victim's lips reproduced the zigzag of the blood source, the abrasion, between her eyes. This suggested some object applied to the victim's face with a reproducible zigzag configuration. TIMING IS E V E R Y T H I N G Unclassified spatters (spots, stains) could be seen on the victim's bra, which were exposed by paramedics a t t e m p t i n g to resuscitate her (see Figure 5-4). E m e r g e n c y people n o t e d the stains were dry on the bra when uncovered, before resuscitation efforts.
Only if the external C is equal to the internal can we calculate the incident angle by measuring the stain. Most instructors answer questions of disparity in size by claiming that proportionality remains the same. This may justify the procE ess but no specific study has been found that shows that there really is proportionality. Advocates of the technique claim that since the ellipse is completed based on the initial contact angle location, the angle would be the same at the lower end of the duplicated curvature.