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A criminal investigation is an applied science that involves the study of facts, which are then used to inform the criminal process. A full criminal investigation may include the search, interrogation, interviews, evidence collection, and preservation of evidence and various investigation methods. Modern criminal investigations usually use many modern scientific methods, commonly known as forensic science.

A criminal investigation is an ancient science that dates back to as c. 1700 BCE in the writings of the Codex Hammurabi. The Code assumes that the prosecutor and the accused had the right to present the evidence collected. In the modern era, criminal investigations are most often carried out by state police forces. Private investigators are also often hired to complete or facilitate criminal investigations.

The previously registered professional criminal investigator was an English policeman. Around 1250 CE, it was recorded that the policeman should “record matters of fact, not questions of court and law.” Federal Criminal Investigator Association.

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