This new edition of the Practical Handbook for Professional Investigators, is required material for new certification programs from the US Association for Professional Investigators and Boston University. This practical reference includes a revised job description, realistic earning capabilities, and future outlook. Updated chapters cover new cases in legal investigation, fraud, computer crime, and domestic disputes. It provides the latest information on civil and criminal investigation cases as well as additional material on case file management with new forms, the component method of criminal defense investigation, foundations of investigation, due diligence, testifying, and interrogation for the non-law enforcement professional.