Podcast
Questions and Answers
What is the primary purpose of collecting saliva from the skin in forensic investigations?
What is the primary purpose of collecting saliva from the skin in forensic investigations?
The double swab technique involves only one swabbing action.
The double swab technique involves only one swabbing action.
False
What is the reason for air-drying the swabs before analysis?
What is the reason for air-drying the swabs before analysis?
To prevent contamination and preserve the integrity of the saliva sample.
Swabs must be kept _____ and dry prior to testing to minimize degradation of salivary DNA.
Swabs must be kept _____ and dry prior to testing to minimize degradation of salivary DNA.
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Match the collection method with its reason for use:
Match the collection method with its reason for use:
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Study Notes
Saliva Collection for Forensic Analysis
- Saliva on skin is a valuable source of evidence in forensic investigations.
- Saliva contains DNA and other biological markers, crucial for identification and analysis.
- Double Swab Technique is used to collect saliva effectively.
Double Swab Technique
- First swab, moistened with distilled water, is used to wash the skin's surface contacted by the tongue.
- This ensures thorough removal of saliva for collection.
- Second swab, dry, absorbs remaining moisture from the skin.
- This maximizes sample collection.
Swab Processing
- Both swabs are air-dried at room temperature to minimize contamination.
- Air-drying preserves the integrity of the saliva sample.
- Swabs are kept cool and dry to prevent degradation of salivary DNA and bacterial growth.
Additional Samples
- DNA samples from the victim might be collected for comparison.
- Buccal swab: Non-invasive method for obtaining DNA, used for comparison with saliva samples.
- Whole blood sample: Provides an alternative source of DNA, ensuring a comprehensive collection of genetic material.
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Description
Explore the intricacies of saliva collection in forensic analysis with a focus on the Double Swab Technique. Learn how this method enhances the preservation of biological markers for identification purposes. Understand the importance of processing and minimizing contamination of samples in forensic investigations.
