However, the crime scenes of today are making the process more difficult with the potential recovery of chemicals, explosives, biological or radiological materials. Photography of the scene and of evidence is one of the first procedures performed at a scene. Of course interwoven throughout these five steps is the recording of the crime scene by photographs, sketches, and field notes. Mark the item of evidence when possible. Trace evidence may be used to associate an individual s with a crime scene or another individual. Discuss: What steps should be taken to secure the crime scene? These five basic functions or tasks are as follows: 1.
Luminol causes a chemical reaction to occur with blood, resulting in luminescence or glow. In cases such as a simple residential burglary, you may only need your standard equipment and regular staff. A crime scene sketch may not be completed on every case, however some form of sketching usually occurs in most cases, i. The last step in the protocol is to process the crime scene. The more things you can carry to the scene, the better.
To facilitate this process, crime scene specialists may create an evidence-free pathway leading to the primary area of interest by conducting a thorough sweep for evidence in that area. There are certain tasks related to each work objective. Additional forensic resources may also be requested to handle special situations. Use paper wrapping to prevent contamination during the transfer. No one book stands alone. Safety is of paramount importance during the initial approach to the scene.
This intermingling of the steps in the protocol will continue throughout the processing of the crime scene. The other part of the equation to successful crime scene processing besides knowledge is ability. The detective works in tandem with a team of crime scene personnel who search the scene and collect the evidence. In the field of crime scene processing several books have been written on what these tasks are and how they should be incorporated into the field of crime scene processing. Photographing the crime scene to record a pictorial view of what the scene looks like and to record items of possible evidence.
Content of the Lesson: Because evidence can be used in court to convict persons of crimes, it must be handled in a scrupulously careful manner to avoid later allegations of tampering or misconduct which can compromise the case of the prosecution toward acquittal or to overturning a guilty verdict upon appeal. In either case, the crime scene investigator advises the detective or officer in charge of the crime scene of findings so the agency can proceed with its investigation. Photograph the crime scene as the third step in the protocol. Hopefully we have developed a training and certification program that can meet the needs and requirements of all police agencies. Working a crime scene requires a well-thought out process and attention to every detail. Marking some items directly may interfere with forensic analysis of the item. It is difficult to explain to someone the exact protocol that will be used at every crime scene.
This class is tailored to provide the investigator with a fundamental, yet necessary understanding of crime scene processing concepts, theories, protocols, and techniques. How a Crime Scene Investigation is Conducted The circumstances that investigators encounter at the scene will largely dictate the approach used to process the scene. This 3-day course is designed to provide the novice homicide detective, and crime scen e investigators with guidelines for processing homicide crime scenes. Even talk to people who didn't see anything. You'd think this would be pretty easy, but it's not.
Examine the scene for what? Visual communications are substantiated and verified by quality, concise and accurate photographs of both the scene and the evidence as it was found. Also look for small things like hairs and fibers. When only a small amount of the stain is available, concentrate as much of the stain as possible on the tip of the swab. Yet each book varies only in the technique used, not in a change of the basic protocol used for the processing of crime scenes. Knowing the type of crime will help investigators anticipate the evidence that could be present. However, to ensure a thorough process, the seven steps outlined below are often followed.
A finished sketch may be used when presenting evidence. What evidence can be collected? When new or additional information is developed concerning the crime scene, the agency should communicate that information to the crime scene investigator. Dick Warrington is in research and development and a crime scene consultant and training instructor for the Lynn Peavey Company. But a complex case or a major crime such as a homicide usually requires much more intensive processing. The first step in processing a crime scene is interview. . Examine the crime scene as the second step in the protocol.
Then, tell students that prior to their arrival a crime was committed in the classroom. This intermingling of the steps in the protocol will continue throughout the processing of the crime scene. A crime scene sketch may not be completed on every case, however some form of sketching usually occurs in most cases, i. Any relevant information regarding the processing of the scene and any specific scene-processing directions or evidence collection should be made known prior to scene entry. Students should be forewarned that the content of this course contains numerous death scene photographs that are highly graphic and intense. The complexities of Homicide cases ensures that those completing this course will be skilled in the managment of any type of crime scene. Detectives may not always be the first on scene to survey and collect evidence.
Examine the crime scene as the second step in the protocol. Upon finding such items of evidence the technician will need to photograph their location and possibly complete a sketch showing the exact location of the evidence or perhaps a sketch of the footwear pattern. Scene Search for Trace Evidence Trace evidence is any material such as hairs, fibers, glass, soil, paint, etc. This protocol should be used in all crime scenes. Examining the scene to identify possible items of evidentiary nature, identify point of entry and point of exit, and getting the general layout of the crime scene. The training must include the following categories; Crime Scene Management, Crime Scene Photography, Latent Evidence, Impression evidence, Biological Evidence, Trace Evidence, Crime Scene Sketching, Report Writing, Crime Scene Investigation. To conclude, the student will have the opportunity to apply what they have learned to a crime scene scenario and group exercise.