How is a latent fingerprint left at a scene or on an object?

A latent fingerprint is left at a crime scene primarily through the process of sufficient contact involving the transfer of oils, sweat, and other substances from the fingers or palms onto a surface. This transfer occurs without any intentional marking; rather, it is an unintentional deposit of skin oils and sweat that occurs when a person touches an object.

This is important in forensic science because these prints may not be visible to the naked eye initially, hence the term "latent". Investigators use various techniques to enhance or visualize these prints after they are left, but the fundamental mechanism involves the natural deposits from the skin during contact.

While other methods exist to reveal or enhance fingerprints, such as chemical sprays or special inks, they are used after the latent print has already been left at the scene. The other options describe techniques or methods related to the visualization or enhancement of fingerprints rather than the actual process of creating a latent print.