Final answer:
The Special Investigations Unit (SIU), or Office of Criminal Investigations (OCI), is a federal branch established to investigate criminal cases in regulated industries. They focus on pursuing cases involving fraudulent claims and adulterated goods, collaborating with law enforcement agencies and scientists.
Step-by-step explanation:
The *Special Investigations Unit (SIU)*, also known as the Office of Criminal Investigations (OCI), is a branch of the federal government established in 1991 to investigate criminal cases related to regulated industries. OCI Special Agents focus on pursuing and developing cases involving criminal actions, such as fraudulent claims and the shipment of adulterated goods. They work closely with other law enforcement agencies, such as the Federal Bureau of Investigation (FBI) and Interpol, and collaborate with scientists and experts to develop the technical aspects of a case.