Investigative journalism is a form of journalism in which reporters deeply investigate a single topic of interest, such as serious crimes, political corruption, or corporate wrongdoing. An investigative journalist may spend months or years researching and preparing a report. Practitioners sometimes use the terms "watchdog reporting" or "accountability reporting".
Most investigative journalism has traditionally been conducted by newspapers, wire services, and freelance journalists. With the decline in income through advertising, many traditional news services have struggled to fund investigative journalism, which is time-consuming and therefore expensive. Journalistic investigations are increasingly carried out by news organisations working together, even internationally (as in the case of the Panama Papers and Paradise Papers), or by organisations such as ProPublica, which have not operated previously as news publishers and which rely on the support of the public and benefactors to fund their work.
University of Missouri journalism professor Steve Weinberg defined investigative journalism as: "Reporting, through one's own initiative and work product, matters of importance to readers, viewers, or listeners." In many cases, the subjects of the reporting wish the matters under scrutiny to remain undisclosed. There are currently university departments for teaching investigative journalism. Conferences are conducted presenting peer reviewed research into investigative journalism.
British media theorist Hugo de Burgh (2000) states that: "An investigative journalist is a man or woman whose profession is to discover the truth and to identify lapses from it in whatever media may be available. The act of doing this generally is called investigative journalism and is distinct from apparently similar work done by police, lawyers, auditors, and regulatory bodies in that it is not limited as to target, not legally founded and closely connected to publicity."
American journalism textbooks point out that muckraking standards promoted by McClure's Magazine around 1902, "Have become integral to the character of modern investigative journalism." Furthermore, the successes
of the early muckrakers continued to inspire journalists.
An investigative reporter may make use of one or more of these tools, among others, on a single story:
Analysis of documents, such as lawsuits and other legal documents, tax records, government reports, regulatory reports, and corporate financial filings
Databases of public records
Investigation of technical issues, including scrutiny of government and business practices and their effects
Julius Chambers of the New-York Tribune had himself committed to the Bloomingdale Asylum in 1872, and his account led to the release of twelve patients who were not mentally ill, a reorganization of the staff and administration, and eventually to a change in the lunacy laws;this later led to the publication of the book A Mad World and Its Inhabitants (1876).
Nellie Bly, a pseudonym used by Elizabeth Cochrane Seaman in the late 19th century, famously feigned insanity as part of her 1887 undercover investigation into and subsequent exposé regarding the inner-workings of the Women's Lunatic Asylum in New York City. Published to wide acclaim as a series of articles in the New York World which were later compiled and further detailed in her book Ten Days in a Mad-House, Bly's revelations led to both a grand jury investigation of the asylum and increased funding for the Department of Public Charities and Corrections.
The Daily Telegraph investigated claims that various British Members of Parliament had been filing dubious and frivolous expenses claims, and had done for many years in secret. The House of Commons Authority initially tried to block the release of the information, but the expenses were leaked to the Telegraph. The newspaper then released pieces of information which dominated the news for weeks and caused considerable anger in the UK.
John M. Crewdson of the Chicago Tribune wrote a 1996 article proposing the installment of defibrillators on American airliners. Crewdson argued that based on his research and analysis, "Medical kits and defibrillators would be economically justified if they saved just 3 lives each year." Soon after the article's publication, airlines began installing defibrillators on planes, and the devices began to show up in airports and other public spaces. Ten years after installing defibrillators, American Airlines reported that 80 lives had been saved by the machines.