Criminal Investigation- is an art that deals with the identity and location of the offender and prove his guilt in a criminal proceeding.
Criminal Investigation- it is the systematic method of inquiry that is more a science than an art. The logic of scientific method must however, be supplemented by the investigator's initiative and resourcefulness. The sequences of the investigation should be regarded by scientific, operating framework that requires improvising on the part of the investigator.
Investigator- is the person who is charged with the duty of carrying out the objectives of criminal investigation. He is an individual who gathers documents and evaluates facts about crime
Special Crime Investigation- deals with the study of major crimes based on the application of special investigative techniques. It is also the study concentrates more on physical evidence; it’s collection, handling, identification and preservation in coordination with the various criminalists in the crime laboratory. Special crime investigation involves close relationship between the investigator in the field and the investigator in the laboratory- the Criminalist.