탐사보도
Investigative journalism is a primary source of information. Investigative journalism often focuses on investigating and exposing unethical, immoral, and illegal behavior by individuals, businesses and government agencies, can be complicated, time-consuming and expensive—requiring teams of journalists, months of research, interviews (sometimes repeated interviews) with numerous people, long-distance travel, computers to analyze public-record databases, or use of the company's legal staff to secure documents under freedom of information laws.