A latent fingerprint is
|“||a fingerprint "image" left on a surface that was touched by an individual. The transferred impression is left by the surface contact with the friction ridges, usually caused by the oily residues produced by the sweat glands in the finger.||”|
- ↑ Biometrics Identity Management Agency, Biometrics Glossary, at 41 (Ver. 5) (Oct. 2010) (full-text).