The Field Interview System is an automated file that has a record for each person field interviewed.   People are field interviewed generally because they are found in suspicious circumstances.  Therefore, the people in this file could be suspects at a later time.   There are several names on one field interview card, for when there is more than one person at the location of the field interview.  It is important that these names be associated with one another.  Because of this, all names are kept in the same automated record.   Through the Master Name File, these names are associated with one another.