Car Carpet Fiber Forensic

Fiber properties and textile fabrics.

Car carpet fiber forensic.

There are several reasons why synthetic fibers are preferred by many over natural fibers such as wool including cost strength durability and stain resistance. Some labs then extract the dye from the fiber and analyze it by thin layer chromatography hinks says. 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 of the fiber samples were obtained from collaborative testing services a commercial company.

After all thousands of cars may have this particular carpet. Natural fibers vary in length depending on the source. When it comes to synthetic fibers there are four major types of fibers used for carpeting. Fibers can also transfer from a fabric source such as a carpet bed or furniture at a crime scene.

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. 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.

More specifically if the victim was transported or assaulted in a vehicle carpet fibers from this vehicle may be collected. 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. Synthetic man made fibers make up the biggest portion of the wall to wall carpet market. The establishment of an automotive carpet fiber database may aid investigative efforts.

Most forensic labs currently employ polarized light microscopy to identify fibers. Forensic scientists distinguish four broad categories of fibre. Roux in encyclopedia of forensic sciences second edition 2013. In forensic science analysis carpet fibers of unknown origin are often discovered as trace evidence on a victim s person or clothing.

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. After obtaining a search warrant the police impound the car and submit it to forensic testing. Carpet fibers from the car are consistent in all respects with the fibers found on the victim.