The opening chapter considers the legal parameters for private detectives in the areas of arrest, search and seizure, the use of force, defamation of character, and State regulation of private detectives State-by-State. Criminal and civil law are distinguished in the next chapter, followed by an explanation of the law of evidence under the topics of admissibility, burden of proof, direct evidence, circumstantial evidence, real evidence, presumptions, hearsay evidence, corpus delicti, best evidence rule, courtroom testimony, and cross-examination. Another chapter explains how information and evidence are obtained by the police and how the private detective may use them. Physical or real evidence in an investigation is explained, and various types are identified. Subsequent chapters provide guidance on developing 'leads,' interviews and interrogation, and surveillance. Detailed guidance is provided on investigations of homicide, arson, and other criminal investigations, followed by a discussion of civil investigations, with particular attention to divorce investigations. The final chapter offers advice on starting a private detective business. Review questions accompany each chapter, and options for final examinations are provided, along with a glossary.