How do you photograph blood spatter?

Blood evidence can be photographed using color print film and/or color slide film. Infrared film can also be used for documenting bloodstains on dark surfaces. Overall, medium range, and close up photographs should be taken of pertinent bloodstains.

How do blood spatter analysts identify each at a crime scene?

From what may appear to be a random distribution of bloodstains at a crime scene, analysts can categorize the stains by gathering information from spatter patterns, transfers, voids and other marks that assist investigators in recreating the sequence of events that occurred after bloodshed.

What are blood patterns at crime scenes called?

Bloodstain pattern analysis is the use of the bloodstain size, shape, and distribution patterns found at a crime scene in order to determine the bloodshed event(s). Bloodstain patterns reveal not “who” but “what and how” with regard to the bloodshed event.

What are the 6 patterns of blood spatter?

1902, Dr. John Glaister described 6 patterns: a.

What is the most important rule for a crime scene photographer?

Therefore, crime scene photographers must ensure their work is both ethical and honest while capturing as much accurate information and detail as possible. Documenting all elements of a crime scene is a major stepping stone when trying to piece together what happened, how it happened and who did it.

Why is it important to take pictures without scales?

As humans we need scaled to know how large and small the surround world is. In photography it helps us to enjoy the image instead of adding mental work to figure out the size of various elements.

What are the 4 types of passive bloodstains?

What are the 4 types of passive bloodstains?

• Passive Bloodstain. Passive Bloodstain on a rough surface (such as wood or concrete)
• Projected Bloodstain. Projected Bloodstain, possibly a Cast-Off Pattern or a HVIS.
• Transfer Bloodstain.

What can a void tell a spatter analyst?

Void Patterns An object that leaves a void in a bloodstain pattern will have a matching bloodstain pattern on its surface, allowing analysts to replace it in the scene if found. Void patterns are most useful for establishing the position of the victim(s) and assailant(s) within the scene.

How do you know if blood is splattered?

A blood drop striking a smooth surface at a 90° angle will result in an almost circular stain; there is little elongation, and the spines and satellites are fairly evenly distributed around the outside of the drop. Below 75°, spines begin to become more prominent on the side of the spatter opposite the angle of impact.

What two forces act on a falling drop of blood?

The spherical shape is caused by the surface tension of the blood. Surface Tension causes the blood drop to pull itself in; both horizontally and vertically. The blood drop will settle into a spherical shape, as a result of the surface tension.

What is a satellite drop of blood?

satellite spatter. small drops of blood that break off from the parent spatter when the parent droplet strikes a target surface. blood spatter. a random distribution of blood stains that vary in size and that may be produced by a variety of mechanisms.

What are the four essential elements of photography?

4 Basic Elements of a Great Photo

• Lighting. The first thing to look for before you start shooting is what kind of lighting you’re working with.
• Clarity. As I said above, readers want to see what’s in the photo.
• Color. This is a huge pet peeve of mine.
• Staging/Composition.

How is a crime scene analyzed?

Crime scene analysis involves collecting and analyzing evidence. Field investigators often work directly at the crime scene. Bullet fragments may be analyzed during a crime scene analysis. One of the first steps in crime scene analysis is securing the location so access is limited to investigators.

How does blood spatter analysis work?

A blood spatter analyst examines blood and its patterns at a crime scene to determine cause of death. This specialized forensic scientist may physically visit crime scenes, as well as analyze photos in a laboratory environment, to gain more knowledge about the object used in the crime and the perpetrator’s position relative to the victim.

How are Bloodstain Pattern Analysis works?

How Bloodstain Pattern Analysis Works. When a crime results in bloodshed, the blood left behind functions as evidence for investigators . However, a bloodstain pattern analyst can’t simply glance at drips and smears of blood and immediately tell you the who, what and when of a crime scene.

What does blood stain analysis examine?

Bloodstain pattern analysis uses an analysis of the color, shape, and size of blood stains at a crime scene, as well as principles of fluid mechanics and biology to draw conclusions about the nature and proceedings of a crime scene.