THE NATURE OF INVESTIGATIVE WORK IS DESCRIBED, WITH ATTENTION TO THE SKILLS AND TECHNIQUES NECESSARY TO CONDUCT INVESTIGATIONS EFFECTIVELY. THE VARIOUS TYPES OF INVESTIGATIONS, PEOPLE, AND SITUATIONS A SECURITY INVESTIGATOR CAN EXPECT TO ENCOUNTER ARE DISCUSSED, ALONG WITH THE LEGAL RAMIFICATIONS OF THE INVESTIGATOR'S ACTIONS. THE FOLLOWING AREAS ARE EXAMINED INDIVIDUALLY: WITNESS INTERVIEWING, INFORMATION SOURCES, UNDERCOVER OPERATIONS, SURVEILLANCE, POLYGRAPH INTERVIEWS, APPLICANT INVESTIGATIONS, REPORT WRITING, INTERNAL THEFT, SHOPLIFTING, BOMBINGS AND KIDNAPINGS, MENTAL DISORDERS, SEXUAL DEVIANCE, DRUG ABUSE, THE LAWS OF ARREST, SECURING SUSPECTS, AND COURTROOM TESTIMONY. SUGGESTED STUDY QUESTIONS ARE INCLUDED IN EACH CHAPTER. AN INDEX IS PROVIDED. (AUTHOR ABSTRACT MODIFIED--KBL)