Correspondent banking could arguably be one of the most difficult business lines for AML (Anti-Money Laundering) suspicious activity systems to monitor, but are there any opportunities for improvement and increased sophistication? The fundamental conundrum for Compliance departments monitoring correspondent banking payment activity is that they must rely on the respondent bank's AML policies, procedures, controls and technology systems to identify suspicious activity and to take appropriate steps to mitigate the risks which could result in the respondent bank ending relationships with nefarious customers. In order to remain proactive banks providing access to the US financial markets via correspondent banking relationships should consider increasing the sophistication of how they detect suspicious activity based on what information is already contained in the wire payments and existing watch lists.