See also the instructional videos on "Latent Fingerprints"
The long story of that inescapable mark of identity has been told and retold for many years and in many ways. On the palm side of each person’s hands and on the soles of each person’s feet are prominent skin features that single him or her out from everyone else in the world. These features are present in friction ridge skin which leaves behind impressions of its shapes when it comes into contact with an object. The impressions from the last finger joints are known as fingerprints. Using fingerprints to identify individuals has become commonplace, and that identification role is an invaluable tool worldwide.
What some people do not know is that the use of friction ridge skin impressions as a means of identification has been around for thousands of years and has been used in several cultures. Friction ridge skin impressions were used as proof of a person’s identity in China perhaps as early as 300 B.C., in Japan as early as A.D. 702, and in the United States since 1902.