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In the courtroom, if the defendant questions the chain of custody of the evidence it can be proven that the knife in the evidence room is the same knife found at the crime scene. However, if there are discrepancies and it cannot be proven who had the knife at a particular point in time, then the chain of custody is broken and the defendant can ...
Evidence packaging involves the specialized packaging methods and materials used for physical evidence. Items need to be collected at a crime scene or a fire scene, forwarded to a laboratory for forensic analysis , put in secure storage, and used in a courtroom, all while maintaining the chain of custody .
Different types of crime scenes include outdoors, indoor, and conveyance. Outdoor crime scenes are the most difficult to investigate. The exposure to elements such as rain, wind, or heat, as well as animal activity, contaminates the crime scene and leads to the destruction of evidence. Other factors such as not properly securing the crime scene ...
Evidence must be managed and administered over its entire lifetime. The lifetime of a piece of evidence includes a number of key stages, [3] [4] from the piece of evidence's acquisition to its eventual disposal: Acquisition, which can be by: Collection, for example at a crime scene; Seizure; Voluntary deposit; Description, which includes ...
When a crime is committed, fragmentary (or trace) evidence needs to be collected from the scene. A team of specialised police technicians goes to the scene of the crime and seals it off. They record video and take photographs of the crime scene, victim/s (if there are any) and items of evidence. If necessary, they undertake ballistics examinations.
Crime scenes can be major sources of physical evidence that is used to associate or link suspects to scenes, victims to scenes, and suspects to victims. Locard's exchange principle is a major concept that helps determine these relationships of evidence. [3] It is the basic tenet of why crime scenes should be investigated.
Around 6 a.m | Evidence at the scene. Matthew Edgar's rifle – the murder weapon -- was found at the crime scene. ... Instead, she heard from a friend that Lewis was in trouble and showed up at ...
It is also used to link suspects or victims to each other or to crime scenes. When a sample is located at a crime scene, it must be collected, processed, and transported, along with a chain of custody, to the laboratory for analysis, so that if a DNA profile is generated it can be accepted in court. Proper evidence collection and preservation ...