The changes in time have been associated with increased levels of crime. The continued cases of robbery, murder and rape have been countered with the adoption of various forensic procedures to bring the crime perpetrators to book. These methods include DNA analysis, face recognition, forensic odontology, forensic pathology, use of finger prints, hairs and fibers, criminal profiling and serology (Jackson, 2002). This paper outlines how hairs and fibres play a crucial role in the investigation of crime. Biologists have always associated hair to dead cells. Hair primarily made up of keratin is characterized by differences in growing rates (Ramstard, 2006). For instance the head hair grows at a slower rate compared to the beard but at a faster rate compared to the body hair. The fact that hair does not decompose gives an edge over other forensic methods. The durability aspect has been applied to investigate criminal cases that date back several years. It has also been established that hair depicts an absorbent quality which makes it possible to analyse levels of arsenic poisoning (Ditton, 2002). It is usually easy to ascertain whether the hair obtained fell off freely or was as a result of a tussle between the victim and the suspect. Hairs can be subjected to DNA profiling on condition that some root structures are available (Ramstard, 2006). Presence of hair on surfaces of vehicles after an accident is reminiscent of accidents. It is also correct to conclude that a crime weapon bearing a victim’s hair was used against him/her. It is this principle that is used to correlate certain events to crime investigations (Kelly & Phillip, 2004). Fibres are commonly regarded as the basic units of clothing. Fibers may be of different length, strength and pliability depending on the type of fabric desired. Artificial and natural fibers are common. Natural fibers such as wool and cotton have been in existence for many years but the emergence of synthetic fibers has been accepted due to changes in tastes and preferences. Synthetic fibers include silk, nylon and polyester (Reffer & Welzel, 2007). Structural fibres such as asbestos and glass fibres have also been introduced lately. The identification and analysis of natural fibers was simple just by observation and touching. It is usually difficult to identify synthetic fibres because of how designers have combined several varieties in order to achieve desirable results (Reffer & Welzel, 2007). However, it is possible to identify such fabrics through chemical and burning tests. The discovery that hairs and fibres could indeed be useful in crime investigation came in the 19th Century. It was based on the premise that any struggle between a victim and attacker led to the transfer of hairs and fabric between them (Saferstein, 2000). The early 20th century saw the establishment of microscopic examination of hair. The development of this procedure has subsequently been used over the years to provide hints to crime investigators. Previous cases that have shown that hairs can be tools of crime investigation are well documented. A good example involves Mable Tattershaw who was strangled in 1951 (Saferstein, 2000). A thorough examination on her clothes revealed some hair traces. The hair