Even when you have no suspect, prints can be used to develop leads. They sometimes provide hints as the criminal's size, sex, and occupation.
Small prints tend to be made by people with delicate bones.
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.