How do policeman detect fingerprints?

Police use various methods to detect fingerprints, primarily relying on powders, chemicals, and digital scanning technologies. Fingerprint powders, often made from carbon or aluminum, adhere to the oils and sweat left on surfaces, making the prints visible. Chemicals like ninhydrin and cyanoacrylate (super glue) can also be used to reveal latent prints on porous and non-porous surfaces, respectively. Once identified, prints are often captured digitally for analysis and comparison against databases.