In order to apprehend a criminal the first steps involve evidence collection. CSI technicians collect blood samples either by submitting a piece of clothing or by using a sterile cloth and a small amount of distilled water to remove some blood from the body as well as collect blood samples by scraping trace blood spatter from walls and floors into a sterile container using a scalpel. Blood samples are also collected from the body. These samples are then sent to be analyzed to determine if the samples are the same since any blood at the crime scene may belong to either the victim or assailant. The lab will perform DNA analysis on the sample as well as the victim to determine whether or not it can be used later to compare to blood taken from all suspects.…
1. The best choice of a technique when blood is found at a crime scene is analyzing the blood. In the genetics laboratory the person who contributes I would say is Alec Jeffreys as he is known as the father of genetic profiling.…
Bloodstain patterns can help investigators distinguish between an accident and foul play. If two similar-sized blood droplets fall from different heights, the resulting stains will have…
In crime scenes, forensic scientist uses mathematics skills like geometry, trigonometry, distance and angle in bloodstain pattern analysis (BPA). BPA is the interpretation of bloodstains at a crime scene in order to recreate the actions that caused the bloodshed. When determining BPA, analysts examine the size, shape, distribution, and location of the bloodstain to form opinions about what did or did not happen. Analysts uses those math skills to determine where the blood came from, how were the victim and perpetrator positioned when the crime happened, and what direction was the victim wounded.…
As a Crime Scene Investigator (CSI), there are duties that have to be met and a job that has to get done. Part of this job is looking for evidence. There are different types of evidence. Some can be seen with an unaided eye and some can't. Trace evidence cannot be seen with an unaided eye. Every person who is physically involved with a crime leaves some kind of trace evidence such as hair, fibers, and even have gunshot residue left on the perpetrators hands. It is even possible to obtain a confession from the suspect .…
Blood spatter research has become so advanced and is becoming even more high tech on showing how everything went down. This can also help in showing what objects were used when and to do what by their left trace.…
When investigating a crime scene, many different variables are taken into account such as fingerprints, any other forms of DNA, or even clues left behind at a crime scene. Even looking at blood splatter, the forensic technician can conclude an estimated guess to the weapon used, the height of the person, whether it was foul play or not, and even if it was passive patterns or projected patterns. Blood splatter analysis becomes important when recreating a crime scene (Peschel). Bloodstain pattern analysis comes into play; and that is the interpretation of bloodstains at a crime scene in order to recreate the actions that caused the bloodshed (“A Simplified Guide”).…
Why do you think forensic scientists study bloodstain patterns? What can be learned from them?…
3. What does LIBS stand for? What does this do? LIBS stands for Laser Induced Breakdown Spectroscopy. It shows what something is made of.…
4. challenges in analyzing tool marks may include duplicating the marks left by tools through tests in the laboratory, and finding individual…
preserving soil samples, if soil is found on the bottom of a shoe for example…
1. What is liver mortis? How might this reveal information about the time of death?…
Analyzing blood is the worst part of the job to me. It is one the main reasons why I might not pursue this specific career in Criminal Justice. I can’t deal with blood because it affects me mentally. I can talk about it, but the sight may make me nauseous or I could faint, especially if it’s a large amount (pool stains). I could sit and watch the most gruesome horror movie and eat dinner while watching it. However, I do feel I may get over that hump like if I talk about it more and the repetitive experience through the job. I searched around the web and found a few interesting facts about blood splatter analysis. I also found a video explaining blood splatter and its relation to the murder case involving a hammer in Arizona. I will post the…
Some of the things I do at a crime scene are taking photographs of the blood evidence, writing down notes, and examining the blood. I also collect samples with…
Marks, P. (2010). Blood spatter model to help crime scene investigation. New Scientist , 20.…