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Contaminated evidence is any foreign material that is introduced to a crime scene after the crime is committed. [1] Contaminated evidence can be brought in by witnesses, suspects, victims, emergency responders, fire fighters, police officers and investigators. [2] Juries expect to see forensic evidence before they render a verdict based on that ...
Once the crime scene investigation unit, arrives on the scene, being sure not to touch anything, an initial walkthrough is performed. This walkthrough helps the investigators get an understanding of what kind of crime has occurred. The unit notes on the presence of potential evidence and devises a plan for processing the scene. [5]
For example, Interpol has published standards to combat corruption, and Standard 4.12 [5] refers to systems and states: "Having and maintaining systems of revenue collection, money and property handling and for the control and preservation of evidence that ensures that those collecting or handling money, dealing with evidence or handling ...
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 .
An identifiable person must always have the physical custody of a piece of evidence. In practice, this means that a police officer or detective will take charge of a piece of evidence, document its collection, and hand it over to an evidence clerk for storage in a secure place. These transactions, and every succeeding transaction between the ...
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Educate people to watch for evidence of tampering. Length of time available for tampering. Particularly in transit, anyone intending to tamper with tamper-evident-protected goods, valuables, cash and confidential documents generally only has a window of opportunity of a few minutes before discovery is likely.
The collection method used is entirely based on what the evidence type is and the surface it is on. It is also important to note that great care must be taken to prevent contamination of the evidence with other substances (such as natural oil and sweat on the hand of the collector). [8]