A four-year high school diploma or its educational equivalent and five years of satisfactory, full-time experience as an investigator evaluating credit worthiness, searching for assets, verifying information concerning education, experience, and other personal qualifications bearing upon character and fitness for employment, or performing investigations involving the research, compilation and/or location of evidence or information in order to build a case or uncover activities of a criminal, corrupt, unlawful or unethical nature; or. With a staff of 1,000, the Division covers a broad range of subject matter, including oversight of environmental investigations, lead poisoning, injury prevention, occupational health, food safety, childcare, radiation control, recreational and drinking water quality, air quality, climate health, vector control, veterinary public health and pest control.