Blood Spatter analysis
a.Determine impact angles for each drop of blood by
i. Measuring the length and width of each droplet of blood
ii.Determining the R value (R= width/length) for each drop.
R= width/ length of each blood drop
Once you determine the R value,use the sine table or your calculator to determine impact angle
Angle impact= arc sine of width/length
b.Determine the area of convergence by drawing lines of convergence
a.Determine impact angles for each drop of blood by
i. Measuring the length and width of each droplet of blood
ii.Determining the R value (R= width/length) for each drop.
R= width/ length of each blood drop
Once you determine the R value,use the sine table or your calculator to determine impact angle
Angle impact= arc sine of width/length
b.Determine the area of convergence by drawing lines of convergence
c.Once you have point of origin,measure the distance from the area of origin to an individual blood spatter stain
d. Once you know the distance from the blood spatter stain, and the angle of impact, use the law of tangents to determine the height of the target (the source of blood)
With this measuremets, we get this results:
Angle impact = arc sine (width/length)
Angle impact = arc sine (1,2/ 1,7)= arc sin (0, 611) = 41,81 degrees
We determine the area of convergence by drawing lines of convergence. After that, we measure the distance from the area of origin to an individual blood spatter stain. We find that distance is 85 cm.
So, using the law of tangents we determine the height of the target (the source of blood):
Tangent Angle = Height / Distance
Angle impact we get: 41,81 degrees
Distance from the area of origin to ann individual blood spater stain: 85 cm
Height = Tangent Angle * Distance
Height = Tangens ( 41,81) * 85
Height = 0,8944 * 85
Height = 76,02 cm is height of the target (the source of blood)!