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The picture above is an example of a low velocity pattern. You can identify this by the large stains in the picture. Low velocity stains can be measured with a size of 4 mm or greater. The AOI in the picture looks like was slashed upwards at an angle. You can find the exact angle by using the formula SIN ^ width/length. You can tell the direction it is going because the tails are pointing in that direction.

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The picture above is an example of a high velocity blood stain pattern. the blood droplets are very small and has a force of 100 feet / per second. Its very faint and has a mist like appearance. The direction of this splatter sort of goes to the upper left. You can tell the direction because of the tails of the blood stains. The AOI can be found Using the formula SIN ^ width/length.

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The picture above is an example of a medium velocity blood splatter. You can tell by the size of the droplets. This type of splatter is usually created from brute force and stabbings. The stain size for medium velocity is 1 - 4 mm with a force of 5 to 25 feet / a second. Again, the direction of the stain can be figured out by the direction the tails of the blood stains are pointed. You can tell that the AOI is less than 90 degrees to do the elongated, teardrop shape. You can find the exact angle bu using the formula SIN ^ width/length.