How are fingerprints preserved in CSI?

How are fingerprints preserved in CSI?

Richard Saferstein (Former Chief Forensic Scientist) gives expert video advice on: How are fingerprints detected at a crime scene?; What's the difference between a 'visible fingerprint' and a 'latent fingerprint'?; How are fingerprints preserved in CSI? and more...

What's important is the medium upon which the print is deposited, whether it's a porous medium or an un-porous medium. Because ultimately that will dictate how the fingerprint is developed. Whether it be through powder or chemical means. Once it's developed, or visualized, the print will then be photographed and the photograph will serve as the documentation of that print.