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Sex Assault Evidence: Victim's Testimony Alone Can Convict
The key to proper collection, preservation, analysis, and overall usefulness of evidence is open and plentiful communication between investigators, forensic scientists, and prosecutors. Sometimes trace evidence from the victim such as hairs, fibers, blood, etc. Bed sheets, comforters, spreads, etc. If the sheets have wet stains and these can be attributed to the rape, then the investigator should circle these stains and inform the crime lab that those are the relevant stains to be examined. Special Considerations for Sexual Assault Evidence George Schiro Forensic Scientist Louisiana State Police Crime Laboratory When dealing with sexual assaults, the investigator usually has a living victim who can provide the investigator with information which will help in collecting and preserving the pertinent evidence. If the bed is a "high traffic" area, meaning that numerous people have had access to the bed and the bed sheets haven't been cleaned in a long time, then it won't have as much evidentiary value as a bed where only one person had access to it and the sheets have been cleaned recently. If a suspect is established in a rape case, then reference samples should be collected from the suspect for comparison. The investigator should note that he or she circled the stains and as always, air dry the evidence before permanently packaging it. The stain will sometimes be better preserved because the seminal fluid tends to dry faster in the panties. Known saliva samples from the victim must also be air dried along with any other wet or moist samples not including whole blood samples, vaginal washing or any other liquid samples collected. The clothes can also be a source for the suspect's blood, hairs, fibers, or other evidence transferred to the victim from the suspect. Usually, the best sample of seminal fluid comes from the swabs, as long as they are preserved properly. The value of this type of evidence should be carefully considered by the investigator before collecting it. They should be collected as soon as possible because the body begins breaking down the various components in seminal fluid through drainage, enzyme activity, pH, etc. Any information should be passed on to the crime lab, so the forensic scientists will know how to process the evidence submitted. The reason for this is that the moisture in the swabs allows microorganisms to grow which can destroy the evidentiary value of the swabs. This is why the investigator should not hesitate to call his or her crime lab if he or has a question or a problem on the collection or preservation of evidence.
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