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Moist or wet evidence (blood, plants, etc.) from a crime scene can be collected in plastic containers at the scene and transported back to an evidence receiving area if the storage time in plastic is two hours or less, and this is done to prevent contamination of other evidence.
[77] [78] He also admitted that contamination for the results at Cellmark's and the state department could only have occurred at the crime scene since LAPD packaged and ship most of the evidence they tested directly there. [66] If that is where contamination occurred, that means Simpson's blood was at the crime scene.
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 .
Other factors such as not properly securing the crime scene can lead to contamination of evidence. If a crime were committed outdoors and indoors then the outdoor crime scene is the priority. It is very difficult to process outdoor crime scenes at night. Regardless of the lighting used to enhance visibility, it is detrimental to the evidence.
Touch DNA, also known as Trace DNA, is a forensic method for analyzing DNA left at the scene of a crime. It is called "touch DNA" because it only requires very small samples, for example from the skin cells left on an object after it has been touched or casually handled, [1] or from footprints. [2]
On Tuesday, the crime lab announced that it has suspended forensic work that helps police detectives make connections between bullets, bullet casings and guns, saying that such analysis in "a ...
And utilize other methods like police photographers, cartographers, and botanists. It is vital for the Forensic Palynologist to visit the crime scene before the Crime Science Investigators (CSI) or Scenes of crime Officers (SOCOs) to avoid disturbance of environmental evidence and contamination. [10]
The motions filed in Superior Court show that defense lawyers are wondering about the strength of such evidence due to recent announcements regarding toolmark work at the Rhode Island State Crime ...