Which statement about latent print processing is true?

• A. It stores fingerprint data.
• B. It photographs visible fingerprints.
• C. It removes fingerprints from surfaces.
• D. It involves developing invisible prints using powders or chemicals.

Answer: (D)

Latent print processing is about turning invisible fingerprint residues into visible patterns so they can be examined and compared. The statement that best captures this is that processing involves developing invisible prints using powders or chemicals. These methods work because latent prints are usually not visible to the naked eye; they are formed from trace amounts of sweat, oils, and other residues left by the friction ridges of skin.

Powders lightly cling to the residue on nonporous surfaces, making a visible print that can be photographed or lifted. On porous or delicate surfaces, chemical reagents react with components in the residue to create a color change or an image of the print—for example, iodine, ninhydrin, or cyanoacrylate fuming are used in different scenarios. The goal is to render the print visible without altering its ridge detail in a way that would hinder subsequent comparison.

This is distinct from storing fingerprint data (which is about databases and identification systems), photographing existing visible prints (imaging rather than development), or removing prints from surfaces (which would destroy the evidence). The essence of latent print processing is the development step that reveals prints that were not initially visible.