Latent prints examinations.(Evidence Examinations)

Developing Latent Prints at Crime Scenes

The Laboratory is the best place to develop latent prints; however, it is sometimes necessary to develop latent prints at crime scenes. Caution should be taken to prevent destroying latent prints. The following are measures to ensure that crime scene latent prints are protected:

* Photograph latent prints prior to any processing.

* Examine all evidence visually and with a laser or an alternate light source before using any other latent print development process.

* When using latent print development processes, refer to the manufacturer's instructions and the Material Safety Data Sheets. Use personal protective equipment (e.g., safety glasses, masks, gloves, smocks).

* The Processing Guide for Developing Latent Prints is a comprehensive list of latent print processes and protocols. Refer to this document so that proper processes are applied in the recommended order. Following this guide will maximize the potential to develop latent prints and will preserve evidence if other forensic examinations are required. The guide is available at www.fbi.gov/hq/lab/fsc/backissu/jan2001/ lpu.pdf. Law enforcement personnel may request a field manual format of the Processing Guide for Developing Latent Prints by telefaxing a request on agency letterhead to 703-632-8374.

Photographing Latent Prints