Most of it has to do with Intel for fraud and checking records. There is data involved, and compiling information for court cases. There are many schools that teach the specifics in this area. However if you qualify and are in good shape apply with the FBI, they will fill you in as to what they are looking for. Even so, locally many police departments love you guys that would rather sit and compile information then be a cook in the kitchen where there are already to many ruining the scenes, and garbling up forensics. Take some time to look into it online.