Investigation or Investigations may refer to:

Law enforcement

* Investigation, the work of a

detective A detective is an investigator, usually a member of a law enforcement agency. They often collect information to solve crimes by talking to witnesses and informants, collecting physical evidence, or searching records in databases. This leads th ...

* Investigation, the work of a

private investigator A private investigator (often abbreviated to PI and informally called a private eye), a private detective, or inquiry agent is a person who can be hired by individuals or groups to undertake investigatory law services. Private investigators of ...

* Criminal investigation, the study of facts, used to identify, locate and prove the guilt of an accused criminal * Criminal investigation department, the branch of British Police force to which plainclothes detectives belong *

Federal Bureau of Investigation The Federal Bureau of Investigation (FBI) is the domestic intelligence and security service of the United States and its principal federal law enforcement agency. Operating under the jurisdiction of the United States Department of Justice ...

, the primary investigative arm of the US Department of Justice *

Tax investigation Tax investigation is an in-depth investigation processed by a tax authority in order to recover tax undercharged in previous years of assessment. This is the general term in commonwealth countries. It is carried out when a taxpayer is suspected of ...

Medicine

Clinical trial Clinical trials are prospective biomedical or behavioral research studies on human participants designed to answer specific questions about biomedical or behavioral interventions, including new treatments (such as novel vaccines, drugs, diet ...

, an investigation conducted to collect data for new drugs or devices * Investigational New Drug, a category in a USFDA program * Outbreak Investigation

Science and maths

Forensic science Forensic science, also known as criminalistics, is the application of science to criminal and civil laws, mainly—on the criminal side—during criminal investigation, as governed by the legal standards of admissible evidence and criminal ...

investigation, in fields such as accounting, science, engineering and information technology * Investigations in Numbers, Data, and Space, a K-5 mathematics curriculum

Arts, entertainment, and media

Literature

* ''

The Investigation ''The Investigation'' (original title ''Śledztwo'') is a science fiction/detective/thriller novel by the Polish writer Stanisław Lem. The novel incorporates a philosophical discourse on explanation of unknown phenomena. It was first publishe ...

'', a 1959 book by Stanisław Lem * ''The Investigation'' (play), a 1965 play by Peter Weiss

Television

* "Investigations" (''Star Trek: Voyager''), an episode of the television series ''Star Trek: Voyager'' *

Investigation (TV channel) Investigation (formerly Canal D/Investigation'')'' is a Canadian French-language specialty channel. Owned by Bell Media, it primarily broadcasts true crime programming. It originally launched on December 12, 2013. History On August 10, 2011, Ast ...

, a Canadian French-language specialty channel * ''The Investigation'' (TV series), a 2020 six-part Danish TV series * Investigation Discovery, a digital cable channel

Other uses in arts, entertainment, and media

* ''Investigate'' (magazine), a New Zealand current affairs magazine * ''Investigation'' (film), a 2006 Bulgarian drama *

Investigative journalism 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 res ...

, the practice of in-depth reporting or analysis *

Temporal Investigations "Trials and Tribble-ations" is the 104th episode of the American science fiction television series ''Star Trek: Deep Space Nine'', the sixth episode of the fifth season. It was written as a tribute to the original series of ''Star Trek,'' in the ...

, an agency of the government of the United Federation of Planets in the fictional universe of ''Star Trek''