When stabbing through clothing often very limited amounts of blood are transferred on the stabbing object. This is caused, amongst other things, because the blood on the knife is kind of swept clean when the knife is pulled out of the clothes. A cast-off pattern is a bloodstain pattern created when blood is released or thrown from a blood-bearing object in motion.
On photo 11 a pattern of projected blood is shown, caused by adding liquid blood to the fingers of a hand that is swayed through the air along a wall. A typical pattern of blood spatters that are in one line occurs. Arterial spurting An arterial spurting or gushing pattern is a bloodstain pattern s resulting from blood exiting the body under pressure from a breached artery. On the photo below a pattern is shown that was made on a wall in a lab using a big syringe.
Transfer patterns A transfer pattern is a pattern that forms when a wet, bloody surface comes in contact with a second surface. A recognizable image of all or part of the object that caused the pattern can sometimes be observed in the pattern.
On the photos transfer patterns are shown that are caused by a bloodied hand and a bloodied shoe sole. Wipe and Swipe pattern A swipe pattern is the transfer of blood from a moving source onto an unstained surface.
Direction of travel may be determined by the feathered edge. The photo shows a pattern where a victim was dragged by the perpetrator. On the photo a wipe pattern is shown where a person on his socks walked through wet bloodstains.
Spill pattern A spill pattern is a volume of blood that has fallen at once onto a surface. Passive drops Passive drops are drops of blood that are formed under the influence of only gravity. This is often observed in incidents involving moving injured persons. Pool pattern A pool pattern forms when blood has flowed in one place for some time, such as when a bleeding victim stayed there for a period of time. Within the black and the blue circle, flow patterns are visible on the body of a deceased victim.
Crime Scene. Search this site. Intro 2. Eyewitness 1. Eyewitness 2. Time of Death. Time of Death 2. Time of Death 3. Intro to Forensic Anthropology.
Forensic Anthropology 2. Forensic Anthropology 3. Types of Evidence. Class vs. Individual Evidence 1. Individual Evidence 2. Evidence Collection 1. Evidence Collection 2. Evidence Collection 3. When properly documented, bloodstain patterns found at the crime scene, or on a particular person's clothing, can be used to: 1. Confirm or refute the position of a victim, witness, suspect, or defendant 2. Determine if there is evidence of a struggle, or if the assault is "one sided" 3.
Confirm or refute statements made by principles in the case: IE: Are stain patterns on a particular person's clothing consistent with accounts given by the victim, witness, or defendant? Blood Flight Characteristics : Blood will not break up unless it is acted upon by force. The force must be great enough to overcome the surface tension of the blood Blood forms a spherical shape perfect circular shape almost immediately upon separating from the blood source.
The surface tension will maintain the sphere shape of the blood drop until it impacts with the surface. Spatters are created when blood is acted upon by force, and travels through the air before landing on a target surface. Spatter Pattern. Angle of Impact: The steeper the impact, the more elliptical or elongated, the blood drop. Direction: The "tail" points to the direction of the blood drop. The larger the bullet, or projectile, the greater the spatter. Transfers occur when a blood source comes in direct contact with a target surface area.
Transfer - Swipe Pattern. Transfer - Wipe Pattern. Spatter Pattern.
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