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Most low velocity impact blood spatters have a diameter of 4 mm or more. The drops fell at a speed of normal gravity.

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Most medium velocity impact blood spatters have a diameter of 2-4 mm. The drops fell with more energy than gravity.

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Most high velocity impact blood spatters have a diameter of less than 2 mm. This usually occurs from gunshots or explosions.

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Low velocity usually looks like the 90 degree angle of impact. Medium and high velocity looks like the 10-40 degree angles. The smaller the angle, the longer the stain is and has a longer tail. The tail shows the direction that the blood is traveling. The formula for angle of impact is SIN < = width/length.