FIBRE- As Forensic Evidence Vikas Dhanda.ppt
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This document provides an overview of fibres as forensic evidence. It defines fibres as filaments that can be spun or woven, and are the smallest units that make up fabrics. Fibres can associate people to crime scenes, vehicles, or weapons. They are classified and collected through various methods, then examined in a lab through destructive and non-destructive techniques like microscopy, dye comparison, and chemical tests. However, fibres from common mass-produced items have limited evidentiary value, and new fibre types are difficult for experts to identify.
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FIBRE- As Forensic Evidence Vikas Dhanda.ppt
- 1. OVERVIEW Definition Forensic significance Classification Recovery and collection of Fibres Laboratory examination of Fibres Limitations References
- 2. DEFINITION To the criminal investigator the term fibre generally means any tough filament like substance that can be spun or woven. To the textile manufacturer a fibre is the smallest visible unit from which a fabric is made.
- 3. FORENSIC SIGNIFICANCE Fibre is used as an evidence to establish an association 1. Between two persons 2. Between the person and the crime scene 3. Between the person and the vehicle 4. Between the person and the weapon Fibre can be used to establish lack of association to protect the innocent.
- 7. RECOVERY AND COLLECTION There are various methods of Fibres recovery and collection I. Visual Search II. Taping III. Scraping IV. Vacuuming V. Combing
- 9. LABORATORY EXAMINATION OF FIBRES There are two categories of methods which are used for identification and comparison of Fibres I. Non-Destructive method II. Destructive method
- 10. NON-DESTRUCTIVE METHODS Microscopy IR Spectroscopy Birefringence Refractive Index Density Color comparison
- 11. DESTRUCTIVE METHODS Melting point Dye Comparison Pyrolysis Gas Chromatography Heat and Flame test Chemical test
- 12. LIMITATIONS Mass production of fabric material and commonness of such items reduces the evidential value of fibres derived from them. Difficulty of identifying unknown fibres in the lab. There are large number of fibre in the market and new ones are being created all the time. So it is difficult for expert to keep up for the developments.
- 13. REFERENCES Crime investigation P.L. Kirk. Criminalistic and Scientific Investigation Frederick Cunliffe Peter B. Piazza Criminalistics – An introduction to Forensic Science Richard Saferstein Encyclopedia of Forensic Science Vol. II