Bloodstain pattern analysis is a field of forensic science that involves the examination of the shape, size, and distribution of bloodstains at a crime scene to determine the events that may have occurred. Documenting bloodstain patterns is an important part of this process, as it allows investigators to accurately record and analyze the evidence. There are several methods for documenting bloodstain patterns, including photography and sketching.
One method for documenting bloodstain patterns is photography. This involves taking pictures of the bloodstains from a variety of angles and distances, using both natural and artificial lighting. The photos should be taken with a high-quality camera and should include scale references, such as a ruler or coin, to give context to the size of the bloodstains. Photographing the bloodstains allows investigators to capture a detailed record of the scene, which can be useful for later analysis.
Another method for documenting bloodstain patterns is sketching. This involves drawing a detailed, accurate representation of the bloodstains on a piece of paper. The sketch should include the size, shape, and distribution of the bloodstains, as well as any other relevant details, such as the location of the bloodstains in relation to other objects in the scene. Sketching the bloodstains allows investigators to create a visual record of the scene that can be useful for later analysis and presentation in court.
Both photography and sketching are useful methods for documenting bloodstain patterns, and each has its own advantages and disadvantages. Photography is a quick and easy way to capture a detailed record of the scene, but it may not capture all of the subtle details of the bloodstains. Sketching, on the other hand, requires a more time-intensive process but allows for a more thorough and accurate representation of the bloodstains. Ultimately, the choice of which method to use will depend on the specific needs and resources of the investigation.
Bloodstain Documentation and Collection Methods
The presence of bubbles of oxygen in the drying drops can differentiate a pattern created by expirated blood, it also may be lighter in color than impact spatter as a result of being diluted by saliva. Also dependent on ambient temperatures. As the injured person increases speed, the droplets will become more elliptical in shape upon impact. Impact velocity is method in which bloodstains are categorized by velocity groupings: low- velocity LVIS , medium-velocity MVIS , and high-velocity HVIC. Overall photographs are not ideal for analyzing details. Because it helps them make an accurate calculation of the angle of impact when they analyze blood that has hit a surface after being in flight.
Chapter 11 Forensics Review Flashcards
Evaluate angles of impact, points of convergence, and areas of origin. Transfers occur when a blood source comes in direct contact with a target surface area. Various aspects of documentation will be discussed including photography, note taking, and sketching. Can determine the rate at which potassium is released into the vitreous humor and use it to approximate time of death. DEPARTMENT OF JUSTICE NOR ANY OF ITS COMPONENTS OPERATE, CONTROL, ARE RESPONSIBLE FOR, OR NECESSARILY ENDORSE, THIS WEB SITE INCLUDING, WITHOUT LIMITATION, ITS CONTENT, TECHNICAL INFRASTRUCTURE, AND POLICIES, AND ANY SERVICES OR TOOLS PROVIDED. Lorsum sur ipdi, lorsem sur ipci.
METHODS FOR DOCUMENTING THE SIZE AND SCALE OF BLOODSTAIN webapi.bu.edu
Weighing, dissecting and section each organ of the body. Overall photographs This is wide-angle images that capture a large part of a scene. Lorsem sur ipci, lorsa sur iprem. The large rulers show scale in the overall and medium-range photos, whereas the small rulers can be inserted to show scale in the close-up photos. It mentions bloodstain analysis, but only briefly. It is important to analyze the trail as a whole and not just focus on one droplet. Comes in black and gray and works on items such as finished leather and rough plastics, where the texture of the surface tends to hold particles of ordinary powder.
Two methods that are used to determine the scale and size of bloodstain
Examples of facts pointed out in the book are that bloodstains tend to fall in certain patterns based on the motion of an attacker and the victim, and that blood dries at a relatively predictable rate. One of the methods that used is the grid method. What does stringing method tell an analyst? Evaluate aspects of directionality and motion for the pattern. The chromosomes from a parent carry that parent's genes, so the new individual begins life with twenty-three mated chromosomes pairs, each carrying genetic material from one of the parents. Impacts from outside sources result in smaller droplets. Once the grid has been established, photographs are taken of the individual grid units.
Select?two different types of bloodstain patterns discussed in this week's readings, describe each?pattern, explain what causes?each?p
You can ask any homework question and get expert homework help in as little as two hours. A ruler is placed close or next to the bloodstains as they appear in size and their relative positions in the photographs Saferstein, 2011. We are always waiting to answer all your questions. Mid-range photographs are often used to capture a single bloodstain pattern, giving the analyst a good idea about what the overall pattern looks like, but without providing information about how it related to the rest of the scene. High magnification, high resolution, great depth of focus. Speaker: Jeff Gurvis Please contact us at ForensicCOE rti. A certificate of completion is available for all who register and attend this webinar.
