There are two general categories to describe the fingerprint evidence that may be
found at a crime scene or on an item related to a criminal matter: visible fingermarks
and latent fingermarks. These categories are not mutually exclusive, since an item
or surface can carry both visible and latent marks. Any search for fingerprint evidence
must take into consideration the possible presence of both types of fingermark. For
example, a visible fingermark (e.g., a blood mark) should not be enhanced to the
exclusion of any latent fingermarks that may also be present on the item or surface
under examination