An Illinois Order for Investigation is a court order issued by a judge that authorizes a law enforcement agency to investigate a specific situation. It is typically used when there is a need to investigate a crime, such as a homicide, robbery, or burglary. In Illinois, there are two types of Orders for Investigation: an Order of Investigation and an Order of Preservation. An Order of Investigation allows law enforcement to investigate any information or evidence related to the crime. An Order of Preservation, on the other hand, requires law enforcement to preserve any evidence they have collected in the course of their investigation until a court hearing or trial. In both cases, the Order must be provided to the law enforcement agency and signed by the judge before the investigation can begin.