Fibers can also transfer from a fabric source such as a carpet bed or furniture at a crime scene.
Car carpet fiber forensic.
After obtaining a search warrant the police impound the car and submit it to forensic testing.
As discussed previously fibers are considered a form of trace evidence that can be transferred from the clothing of a suspect to the clothing of a victim during the commission of a crime.
Most forensic labs currently employ polarized light microscopy to identify fibers.
After all thousands of cars may have this particular carpet.
More specifically if the victim was transported or assaulted in a vehicle carpet fibers from this vehicle may be collected.
Roux in encyclopedia of forensic sciences second edition 2013.
Digital records and physical samples.
The establishment of an automotive carpet fiber database may aid investigative efforts.
Carpet fibers from the car are consistent in all respects with the fibers found on the victim.
Among the prosecution s forensic evidence were gray carpet fibers collected from duct tape left at two of the crime scenes which an fbi crime lab report claimed exhibited the same.
Fiber properties and textile fabrics.
When it comes to synthetic fibers there are four major types of fibers used for carpeting.
There are several reasons why synthetic fibers are preferred by many over natural fibers such as wool including cost strength durability and stain resistance.
Forensic scientists distinguish four broad categories of fibre.
Wool silk fur note that hair analysis is a specialised field separate from fibre plant e g.
Most of the fiber samples were obtained from collaborative testing services a commercial company.
By itself this match is interesting but not conclusive.
The carpet in his car was very specific to the year make and model of his car and was also found on the boys so they took samples from the car.
Textile fibers generally fall within the range of 10 50 μm in diameter and individual fibers can vary in length from less than 1 cm to thousands of meters.
The carpet fibers found in his house were yellowish green which was the color of the fibers found on the boys and it was discontinued and only made by one company.
Manufactured fibers can be continuous filaments but these.
Synthetic man made fibers make up the biggest portion of the wall to wall carpet market.
Stephen shaw federal bureau of investigations fbi laboratory 703 632 7706 stephen shaw ic fbi gov fbi lab forensic automobile carpet database facd fibers automobile identification.
