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Blood by Conor stellman

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Blood facts <ul><li>Sometimes, the amount of blood in a murder scene can be quite overwhelming, but the savvy detective can read the reddish-brown liquid like a book. The stuff can even point to where the killer stood when he delivered the fatal blow. </li></ul><ul><li>A blood droplet’s direction of travel is easy to determine because of its shape. A drop of blood forms an ellipse when it hits a flat surface. The long axis of the orb is an indication of the travel direction. Also, the ellipse usually has a tail which gives it the appearance of an elongated teardrop. The droplet’s appendage always points away from the victim when it hits a surface from an angle. This is not the case when droplets fall straight to the floor or ground. However, it’s almost always safe to assume the body was directly overhead when the droplet(s) fell. </li></ul>

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evidence <ul><li>Blood droplet was traveling from bottom left to upper right. The victim would have been standing somewhere to the lower left of the droplet. Droplets like this are normally caused by a trauma - a gunshot or a blow by an object, such as a baseball bat. This type bloodstain is called a Projected Bloodstain . </li></ul>

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Types of splatter <ul><li>Low Velocity - This type of spatter is usually caused by an impact to the blood source at a rate of 5 feet per second and is usually about 4 millimeters in diameter. </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li>Medium Velocity - This type of spatter is usually caused by an impact to the blood source at a rate of 5-25 feet per second. Stains caused by this type of force are usually 1-3 millimeters in diameter, but may be larger or smaller. </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li>High Velocity - This type of spatter is usually caused by an impact to the blood source in excess of 100 feet per second and is usually less than 1 millimeter in diameter, although it can be larger or smaller. </li></ul><ul><li> </li></ul>

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Type continued <ul><li>When blood hits a surface at an angle other than 90 degrees, the direction of it's path will be able to be viewed, interpreted and measured, which allows investigators to reconstruct what and how something occurred. Although the picture to the left is is computer generated and not very realistic in appearance, it was made to look the way it is to exemplify how the direction of the path of blood can be indicated by &quot;tail&quot; of the stain. In this example, the blood traveled from the lower left to upper right. If an investigator was attempting to determine where the source of the blood was when the stain was made, an equation can be used, which will give an accurate location. </li></ul><ul><li> </li></ul>

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