Podcast
Questions and Answers
What type of evidence can be transferred when two objects come into contact?
What type of evidence can be transferred when two objects come into contact?
- Metals and plastics
- Hairs and fibers (correct)
- Glass and ceramics
- Documents and photographs
Which of the following is not a type of fiber identified in forensic examinations?
Which of the following is not a type of fiber identified in forensic examinations?
- Acrylic
- Polyester
- Silk
- Granite (correct)
What assessment is performed to determine if hairs are of human or animal origin?
What assessment is performed to determine if hairs are of human or animal origin?
- Optical property analysis
- Chemical analysis
- Physical examination
- Microscopic evaluation (correct)
Which method is utilized for nuclear DNA testing on human hairs?
Which method is utilized for nuclear DNA testing on human hairs?
In forensic investigations, which location is least likely to be a source of hairs and fibers?
In forensic investigations, which location is least likely to be a source of hairs and fibers?
What is the first step in comparing questioned fibers to known samples?
What is the first step in comparing questioned fibers to known samples?
Which of the following does not fall under the capabilities of trace evidence analysis?
Which of the following does not fall under the capabilities of trace evidence analysis?
What properties may be compared between known and questioned fibers?
What properties may be compared between known and questioned fibers?
What should be avoided when collecting hairs and/or fibers?
What should be avoided when collecting hairs and/or fibers?
What is the preferred method for collecting very small hairs and fibers?
What is the preferred method for collecting very small hairs and fibers?
When collecting clothing, what should the individual stand on?
When collecting clothing, what should the individual stand on?
How should individual hairs and fibers from clothing be packaged?
How should individual hairs and fibers from clothing be packaged?
What is a suitable way to package collected evidence?
What is a suitable way to package collected evidence?
Why should high tack adhesive tapes be avoided?
Why should high tack adhesive tapes be avoided?
What is the correct order of operations when removing clothing for evidence collection?
What is the correct order of operations when removing clothing for evidence collection?
In packaging evidence from clothing, what should each clothing item be placed into?
In packaging evidence from clothing, what should each clothing item be placed into?
What should be done if a subject’s clothing has been bagged together?
What should be done if a subject’s clothing has been bagged together?
What method is suggested for submitting large items such as area rugs or vehicle seats?
What method is suggested for submitting large items such as area rugs or vehicle seats?
What is the preferred wrapping method for items submitted for lab analysis?
What is the preferred wrapping method for items submitted for lab analysis?
When submitting known hair samples, which agency can perform further examinations?
When submitting known hair samples, which agency can perform further examinations?
What type of tape is recommended for fiber recovery from large items?
What type of tape is recommended for fiber recovery from large items?
What should be done with a known fabric sample when full items cannot be submitted?
What should be done with a known fabric sample when full items cannot be submitted?
How should recovered tape strips with fibers be submitted?
How should recovered tape strips with fibers be submitted?
What is the purpose of collecting known hair samples?
What is the purpose of collecting known hair samples?
Study Notes
Trace Evidence: Hairs & Fibers Overview
- Hairs and fibers can be transferred when objects come into contact.
- Hairs are assessed to determine if they are animal or human.
- Human hairs are categorized by their suitability for nuclear DNA testing.
- Fibers are identified by color, generic type (e.g., nylon, polyester, acrylic), and compared to samples from known sources.
Capabilities and Services
- Distinguish hairs from fibers.
- Differentiate human hairs from animal hairs.
- Determine the suitability of hairs for nuclear DNA PCR-based typing.
- Fracture match rope/cordage or clothing/fabrics.
- Identify fiber generic class (e.g., nylon, polyester, cotton, silk, wool).
- Compare questioned fibers to known fiber samples.
Collection Guidelines: Individual Hairs and/or Fibers
- Use forceps or gloved fingers to remove hairs and/or fibers.
- Package hairs and/or fibers in a properly folded paper evidence fold, a glassine envelope, or on the adhesive edge of a low tack adhesive note.
- Small hairs and/or fibers are best collected with a low tack adhesive note.
- Do not crush, bend, or use high tack adhesive tapes to recover hairs and/or fibers.
Collection Guidelines: Clothing
- Remove and package each clothing item separately.
- Use new, clean pieces of butcher paper to avoid contamination.
- Package individual hairs and/or fibers recovered from the clothing item with the clothing item.
- Do not separate clothing items if they were previously bagged together or placed in one pile.
Collection Guidelines: Large Items
- Submit items for lab examination whenever possible.
- Use low tack tape with clear/colorless backing and adhesive to recover hairs and/or fibers from large items.
- Alternatively, use painter’s masking tape for collection.
- Place taped strips with recovered hairs and/or fibers onto a clear/colorless plastic sheet, transparency sheet, or plastic bag.
Collection Guidelines: Known Samples
- Collect known hairs for potential future microscopic hair comparisons (not conducted by DFS).
- Submit entire fabric items when possible, or a representative sample that includes all colors and types of fibers.
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Description
Explore the critical role of hairs and fibers in forensic science through this quiz. Learn how to distinguish between human and animal hairs, as well as how to identify various fiber types. Test your knowledge on collection guidelines and the methodologies used in forensic analysis.
