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Bloodstains

Finding the Killer

By analyzing blood stain's shape,size, and position, investigators can figure out where the killer stood, the killer's height, how many times they swung the weapon, and whether they are right or left handed.

Blood stains cannot be removed completely. When a killer tries to hide blood with bleach, investigators use reagents that make the hidden blood visible. Luminol and Fluoresces both react with the iron found in hemoglobin, this helps them find any blood stains the killer tried to hide.

Different weapons project blood in different ways. For example, a bullet strikes a victim with such force that blood is projected at great speed, resulting in tiny drops. This helps identify the weapon that was used.

Different surfaces can affect a blood splatter

Patterns of Blood Stains

Blood pools

suggest that a victim was static, and still alive, since death stops blood flow

Blood Trails

may be surrounded by secondary spatter that shows the direction of movement.

Blood Smear

Circular marks

suggests that the object pressed against the surface will also be stained

form when blood ejected with little force strikes surfaces perpendicular to its path.

Crenellated Marks

result when blood is thrown off at great speed, or falls a large distance.

Elliptical Marks

show drops struck obliquely. A standard formula derives angle from elongation.

Splashes

with well-defined tails indicate that blood struck the surface at an angle of 30 degrees or lower

Blood Spurt

forms characteristic marks on surfaces when blood pumps from a cut artery

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