A computer system detects questionable financial transactions. The system includes a data source component configured to access a database of transaction data, and a data storage component configured to store transaction data that is to be reviewed. An account compilation component of the system is configured to compile data sets from the transaction data. Each data set includes pertinent external transactions in the transaction data that are related to a particular individual client during a screening time interval. The account compilation component excludes internal transactions from the data sets. A screening component is configured to compare each data set with at least one screening criterion. A reporting component is configured to report data sets that satisfy the at least one screening criterion.