A method for monitoring financial accounts to determine the possibility of money laundering and other attempts at fraud includes monitoring the financial accounts owned by a person or entity. Data regarding withdrawals and deposits are extracted from a computer database and analyzed. The analysis includes determining the amount of time between a large deposit and the withdrawal (in one or more transactions) of a large portion of the deposit. A further analysis may include determining the amount of time between a large withdrawal and the time of the earliest deposit, wherein multiple deposits may be combined. Using the above-described data, accounts that are more likely to be used for money laundering and other fraudulent activities.