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Assignment 1: Blood Pattern Analysis A crime scenes give investigators clues as to who, what, where, and when. It is all of the evidence combined that allows for reconstructions. One aspect of crime scene investigation is blood pattern analysis. At a crime scene where there is blood many things can be determined by the pattern of the blood including: location and description of stains and patterns, the means the stain was created (for example a wipe or a swipe, a free fall drop, transfer, etc), the directions the blood was traveling, the origin of a blow, the object used, the minimum number of blows, the presence of obstructions, positioning of the suspect, victim, and objects during the crime, and the sequence of events. More information on blood pattern analysis including the type of patterns can be found at:
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View full documentUnformatted text preview: Because a free-falling blood drop is a sphere when it hits a surface the angle which it impacts the surface can be calculated. The angle of impact is related to the length and the width of the resulting blood stain pattern. To calculate the α angle L =length of the ellipse W= width of the ellipse α = angle of impact sin α = (W/L) α = arcsin (W/L) Note: arcsin is also inverse sine. Sine tables or a calculator can be used to determine the angles. Because angles are unit less it does not matter what unit is used for measurement, but I recommend using centimeters (cm). Questions: 1A - 1H. For your homework calculate the α angle for the blood drops A-H provided. 2. What information can be gained from knowing the alpha (impact) angle of a blood stain?
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