The California Bureau of Investigation is a fictional law enforcement organization of the U.S. state of California featured predominantly in the TV series The Mentalist.
There is an entity known as the Bureau of Investigation & Intelligence (BII)[1] in California which is commonly referred to as "CBI" so as to distinguish it from its federal counterpart, the Federal Bureau of Investigation (FBI). BII commonly works on a variety of cases, some of which have some subject matter overlap with the CBI portrayed on The Mentalist.