Notes+on+pg.+10-13+LR

blood spatter: - a blood spatter pattern is created when a wound is inflicted and blood leaves the body. - it takes more than a single strain of blood to constitute a spatter. - a grouping of bloodstains composes a blood spatter pattern - history: - 1894 - pitoroski: wrote the earliest reference to blood spatter analysis. - today blood spatter evidence is used to explain events at a violent scene.

Blood spatter analysis: - a falling drop of blood ( tear drop) the effect of gravity on blood ( oval) - The cohesive forces in a blood droplet ( circle)

Blood is a thick mixture of blood cells and plasma. when someone is bleeding, gravity pulls it downward toward the ground.

when a drop of blood falls on a flat surface, the blood drop will have a curved surface. The blood drop doesnt totally flatten out.

the small secondary droplertts are knows as sarellites

If blood drops onto a smooth surface, the edge of the blood drop appears smooth and circular.

if the blood lands on a porous surface, such as wood or ceiling tiles, then the edge of the drop of blood may form small spikes or extensions.

blood falling directly to the floow at a 90 degree angle will produce circular drops.

blood found on walls or ceilings are from the pumping action of the heart

splashes are shaped like exclamation marks. THe shape and position of the spatter pattern can help locate the position of the victim at the time of the attack.

pools of blood form around a victim who is bleeding heavily and remains in one place. if the bleeding victim mones to another location, ther may appear to be droplets or smearing conneting the first location with a second.

Lines of convergence: - the location of the source of blood can be determined if they were at least two drops of blood spatter. By drawing straight lines down the long axis of the blood spatter and nothing where the lines intersect, this will indicate the lines of convergence.

blood spatter may also be classified by its speed or velocit on impacting a surface