Is the art and science of reproducing image by means of light through some sensitized material with the aid of a camera, Lens and its accessories and the chemical process required in order to produce a photograph. 

It also refers to the use of a camera and video for law enforcement purposes such as documenting physical evidence and crime scenes, or recording interrogations, traffic stops, surveillance, public thoroughfares, traffic accidents and still images of arrested individuals (Miller, 2007). In short, it is the art or science that deals with the study of principles of photography and its application to police work.

Photography refers to the recording of objects and scenes to be used for and within the legal process. These records result in forensic photographs that can be used for documentation, analysis, intelligence or court presentations. 

It also refers the art, application, and practice of creating durable images by recording light or other electromagnetic radiation, either electronically by means of an image sensor, or chemically by means of a light-sensitive material such as photographic film. It is employed in many fields of science, manufacturing (e.g., photolithography), and business, as well as its more direct uses for art, film and video production, recreational purposes, hobby, and mass communication. (Wikipedia) 

The word photography word was first used by the scientist Sir John F.W. Herschel in 1839 and derived from the Greek words “photos or photos” (light) and “graph or graphein” (to draw or to write). The term, therefore, means “writing with light”. (Lynch-Johnt & Perkins, 2008). 

1.To produce a pictorial record of everything pertaining to the crime.

2.To help in keeping the police officer’s memory accurately as possible as to where he finds things.

3.To help in securing and obtaining confession, disposition and information relating to the case.

1.Small objects but of great importance in a crime committed may escape in the first phase of examination by the investigator but maybe seen and recorded on the photograph.

2.A good photography of the scene is a permanent record which is always available especially in court presentation or in court proceedings.

3.Used as an aid by the investigator to describe in court some of the details of the crime scene they have investigated several months ago, the small details and exact locations of objects.

4.To assist the investigators in using photographic equipment and techniques I in their effort to solve crimes.