Fiber & Examination of fibers

Fibers are important evidence at crime scene. Their significances are given in this presentation

1. Fibers and Examination of Fibers Presented by:- Kapil Raikwar Volunteer Applied Forensic Research Sciences

2. CONTENTS INTRODUCTION COLLECTION AND PRESERVATION EXAMINATION OF FIBERS METHODS OF ANALYSIS FORENSIC SIGNIFICANCE REFERENCES

3. INTRODUCTION Fibres are associative evidence which can be used to establish a link between a suspect and a crime scene. Based on Locard’s principal of exchange, transfer of material will occur when two objects are in contact with each other . Fibres may become important evidence in incidents that involve personal contact – such as homicide , assault , or sexual offences , etc.

4. Collection & preservation Visual Collection : Collected using clean forceps and trace paper, then it is folded & packed in a paper envelope. Tape lifting : Tape is used to lift up the fiber , then it is carefully removed & packed. Vacuuming Method : The samples are collected using the vacuuming method. And are packed in a paper envelope.

5. Examination of fibers Characteristics of fibers that are examined visually. Fiber diameter Fiber cross section Fiber number Fiber color Fiber location

6. Methods of analysis Scanning electron microscopy Atomic force microscopy Chemical or dye analysis

7. FORENSIC SIGNIFICANCE Fibres are used to create a link between the crime and suspect. Unlike fingerprints and DNA evidence, fibres are not specific to a single person. Fibres are a form of trace evidence, easily go unnoticed by the criminals. A carpet’s fibre or from a person’s clothing can indicate the individual’s presence on the crime scene. Fibre examination can reveal whether the questioned fibre belongs to the particular known fabric or not.

8. REFERENCES https://www.google.com/search?q=natural%20fibers&tbm=isch&client=ms-android-xiaomi-rev1&prmd=ibsvn&hl=en&sa=X&ved=0CBQQtI8BKABqFwoTCPDIs6uF4vkCFQAAAAAdAAAAABAG&biw=360&bih=592#imgrc=2I0Z66CWi9LrIM Saferstein, R. (2011). Criminalistics (2 nd ed.). Upper Saddle, NJ: Pearson Learning Solutions.