A corporate investigator uses detective skills to conduct investigations into company policy, structure, and its employees. They are hired to run pre-screenings of new employees and used for clearing up harassment complaints, drug use, and illegal activities such as corporate fraud, copyright infringement, and cyber-criminal activity. In this career, you also research issues like liabilities, security issues, and unfair trade practices when clients are deciding on partnerships and mergers. While you primarily work for corporations, you may also work for individuals. Businesses that offer corporate investigation services specialize in a variety of niches such as credit, criminal history, and background checks. Financial companies often request an investigation into insurance problems, SEC filing history. If you choose this niche, a CPA certification is preferred.