Prints on a wall provide an indication of the suspect's height. Construction workers tend to have rough hands, and musicians tend to develop calluses on the tips of their fingers. Do not rely too heavily on these clues as they are hints, not facts. Prints can also substantiate or disprove the story of a victim or witness by the finding of prints where they should be according to the story. Even the absence of prints may be a key point.
Suicides have no reason to destroy prints.
You may occasionally find a print made with the palm of the hand or a bare foot. These will give you no trouble as you can process them by the same methods you use for fingerprints. Several months before a baby is born, ridges develop on the skin of its fingers and thumbs. These ridges arrange themselves in more or less regular patterns. Each class can be further divided into numerous sub-categories.