UARB is a charity based in the United States. Its mission statement states that UARB's goal is "to help the poor, sick and oppressed people of the world reach their individualize goals of achievement." UARB has been very successful in obtaining donations from its American nationals who have recently moved to the United States. Millions of dollars have flowed into UARB's U.S. bank accounts from these donatins. None of the money collected from these donations is from illegal sources. Once the donations are collected, they are sent to a Nauru bank account and from this bank account checks, money orders, and wire transfers are sent to numerous bank accounts in Europe and Asia.

What is the weakest point in this network on which forensic investigators should concentrate their efforts for determining whether money laundering is occurring?