1. A computer system for detecting questionable financial transactions, the computer system comprising: a data source component configured to access a database of transaction data; a data storage component, coupled to the data source component, and configured to store the transaction data; an account compilation component, coupled to the data storage component, and configured to compile data sets from the transaction data, each data set comprising pertinent external transactions in the transaction data that are related to a respective individual client during a screening time interval, said account compilation component excluding internal transactions from said each data set; a screening component, coupled to the account compilation component, and configured to compare each of said data sets with at least one screening criterion; and a reporting component, coupled to the screening component, and configured to report data sets that satisfy the at least one screening criterion.