Rule 31-2-3.3 - Interstate Identification Index (III)1. All states submit records of felony and serious misdemeanor arrests to the Federal Bureau of Investigation (FBI). The FBI maintains a national data base of these records known as the Interstate Identification Index or III system. The III is an index system which can be used to identify the state in which an arrest occurred.2. Mississippi maintains its own detailed criminal records in the ECCH system. These records are electronically transmitted to the III system. Expunction orders are also forwarded to the FBI for expunction of records in the III system.