Dusting for Fingerprints
By Joe LeFevre
Discover how to select the correct fingerprint powder, the proper dusting and collecting techniques, and how to fill out an evidence card.
This learning object shows how the shape of a stain defines the angle of impact. In general terms the more circular the stain, the more perpendicular will be the angle at which it struck the surface. The more elliptical the shape of the stain, the more acute the angle will be. With practice and experience, the analyst can recognize the general angle of impact based solely on the shape of the stain.