Every society gets the kind of criminal it deserves.
What is equally true is that every community gets the kind of law enforcement it insists on. The science of hairs and fibers has its beginnings with Locard's Exchange Principle. Formulated by Frenchman Edmund Locard, it states that when a subject comes into contact with an object or another person, a cross transfer of evidence occurs. Hairs and fibers are easily shed. Thus, the strands found on an individual will reflect the most recent environmental contact.