Fingerprints

Fingerprints are one of the most important things that link a suspect with a crime scene. Even though that fingerprints are not always left by a criminal, the crime scene should still be examined for them. All people have distinct friction ridges on the skin of the fingers. In leaving an impression, an outline of the ridges is transferred and duplicated by oil, sweat and other substances on the object handled. The impression is usually …

…way to make fingerprints visible is to use radiation. There are two kinds of radiation to use, Ultraviolet rays, and laser radiation. A latent print requires a suitable surface for it to be picked up. Porous surfaces such as unpainted wood and some kinds of paper are unlikely to yield a useful impression. Smooth surfaces like glass, enamel, and glossy paper are ideal to lift the print if you are lucky enough to get it.