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Questions and Answers
What should be done before packaging biological evidence on a table top surface?
What should be done before packaging biological evidence on a table top surface?
- Clean the surface with alcohol wipes.
- Use a plastic sheet to protect the evidence.
- Use Kraft paper to cover the entire surface. (correct)
- Leave the table top uncovered for better air flow.
Why should wet stains be air dried at room temperature before packaging?
Why should wet stains be air dried at room temperature before packaging?
- To avoid destroying the DNA present in the stain. (correct)
- To preserve the structural integrity of the stain.
- To prevent the evidence from becoming too heavy.
- To ensure that the sample absorbs the packaging material.
What should you avoid when collecting a sample of a dried biological substance?
What should you avoid when collecting a sample of a dried biological substance?
- Using a used swab.
- Touching the cotton end of the swab. (correct)
- Moistening the swab with distilled water.
- Swabbing the stain in circular motions.
Which of the following is NOT an acceptable way to package biological samples?
Which of the following is NOT an acceptable way to package biological samples?
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What is required to be affixed to each package of biological evidence?
What is required to be affixed to each package of biological evidence?
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Study Notes
Handling Biological Evidence
- Biological evidence should never be handled on bare table surfaces.
- Kraft paper should be placed over the table surface before handling biological evidence.
- After use, the Kraft paper should be disposed of as biohazard waste.
- Wet biological stains must be air dried at room temperature.
- Do not use heat or sunlight to hasten drying as it may destroy DNA.
- For liquid biological samples, use one package of clean sterile swabs to collect a sample.
- Air dry the sample before packaging.
- For dry biological samples, use one package of clean sterile swabs moistened with distilled water and swab the stain.
- Do not touch the cotton end of the swab.
- Air dry the collected sample before packaging.
- Never package biological evidence in plastic to prevent mold growth.
- Affix a biohazard warning sticker onto each package of biological evidence.
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