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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 evidence. Because of this, attorneys on both sides try to discredit forensic evidence that does not support their clients' interests. This requires crime scene investigators be especially careful to guard against contamination in the forensic samples. A miscarriage of justice can occur when these procedures are not carried out carefully and accurately.[3]