The different types of blood can tell us the method an assailant used such as passive blood stains. These stains are made from the drops off a weapon due to gravity. For instance, if an attacker w... ... middle of paper ... ...can-do spirit crime would almost be eliminated but only one can hope that people can make a change. Everything about analyzing blood seems like it is a suitable career to follow in. Although it isn’t for everyone, this job is demanding.
Knowing this information can help the detectives see the ‘signature’ of the crime, or it can help identify whether they are dealing with a repeat offender. Once the forensic scientists figure out the type of weapon used, they can then begin to find the point of origin. Whether or not the perpetrator is aware of it or not, the patterns made by blood give away t... ... middle of paper ... ...im and the perpetrator can be exposed from the projected spatter. The body’s position can tell detectives whether it was a surprise attack or the victim knew the person who committed the crime. Another way to find the story is with voids.
Their role is to identify the victim and then find out the time of death of the victim and should be done sooner rather than later to get a more accurate result. An autopsy is then carried out to determine cause of death. Criminal Profiler- Their responsibility is to produce a profile to assist the police in the criminal investigation. Their roles is investigate a crime scene, and study reports made by the experts in the case and interviewing witnesses. They then have to work on a psychological profile based on the evidence they have gathered.
Since homicide is a crime in which a life has been ended, it is highly important the investigation surrounding a homicide be taken seriously and be completed effectively. That is, it is critical for the investigator(s), and other branches of the investigation, to be highly trained in preserving a crime scene, as well as interpreting the evidence left at a crime scene, or surrounding the investigation. There are various techniques available to aid in the examination of a homicide crime scene, but none more importantly than what could be told be the body. The wounds that are on the body of a homicide victim, can provide valuable insight as to the circumstances surrounding the homicide. For instance, the type of wound and its location can reveal to investigators what kind of weapon was used, and if the wound could have been self-inflicted.
Constructing a set of guidelines on managing the preliminary investigation for a criminal case is very important as it gives a baseline for officers to follow to help prevent errors in the investigation. According to Hess and Orthmann (2010), “The initial response is crucial to the success of an investigation. Although it is popularly believed that cases are won or lost in court, more cases actually are lost during the first hour of an investigation … than in court” (p. 14). After containing the incident, officers upon arrive will begin examining the scene by taking photographs, sketches or videos. After the scene has been recorded visually, officers will search for evidence, and then collect it for examination and processing while documenting what has been found during the search for clues.
The purpose of a BPA’s is to determine bloodstain patterns and to recreate the action that caused the blood. Locard’s Principle The Locard’s principle is important in any forensic science field, “the principle holds that the perpetrator will take away traces of the victim and the crime scene; the victim will retain traces of the perpetrator and may leave traces of himself or herself on the perpetrator; and the perpetrator will leave traces of himself or herself at the crime scene in many ways” (Geberth, 2007). The Locard’s principle in BPA is applied in the retrieval and evaluation of bloodstain pattern evidence. Classification of Bloodstain Patterns In order to reconstruct a crime scene, analysis must classify the bloodstain spatter, and there are many way to classify blood stain patterns: bloodstain spatter by velocity and bloodstain through taxonomy. In the classification of the bloodstain spatter by velocity, there are three basic categories of stain groups... ... middle of paper ... ...me scene, by recreating the scene using the blood direction a bloodstain patterns.
A forcible rape you want to look at bruises semen stains or witnesses that may have heard screaming. Things like this are very important for an investigator to know to look for (Bennett & Hess, 71). As you can see there are many different steps in investigating crime scenes. It is very important that an officer follow the proper steps in an investigation. Failure to do this can result in a suspect to go free, possible charges against the department.
Once the evidence is found, recorded and packaged, it must be sent to a crime lab for further processing. Each item when shipped should be recorded, logged and accounted for from person to person so when used in a trial, the evidence has been accounted for from beginning to end. The final thing investigators must make sure is that all evidence was seized properly and with probable cause. This is the main reason why in so many court cases evidence is thrown out, improper searches and seizures. If any investigator is in doubt on whether or not a place or person can be search, it is always best to obtain a warrant for that such reason.
It is possible to find the weapon used, number of wounds, trajectory, direction of travel, and how the events unfold in a crime. It can interest very many people, but can also freak them out. Blood spatter pattern analysists are one of the most important people to finding the criminal who has done the crime. There are many things blood spatter analysists are responsible for, including responding to crime scenes, interacting with biohazardous material such as blood and body fluids, taking photographs, collecting samples, writing reports, and testifying in court (“Balance”). Blood spatter requires a strong background in scientific studies, and a bachelors degree in one of the natural sciences.
I also feel that the state of mind that is required to be a successful investigator can be taught through training and experience. 3. The scientific method is the analyzation of evidence, to examine a case from every angle possible, to not give up on an investigation until all of the angles are covered and to not allow personal emotions create a bias in their mind (Osterburg 2010). A scientific method example would be when an investigator arrives to a crime scene, they would first search the area for clues and see if something doesn’t seem right. Next they would have to search for different forms of evidence, most important would be trace evidence because it can provide DNA evidence which can also link a suspect to the crime.