Banks use anti-money laundering (AML) systems and analysts to investigate suspicious transactions and identify illicit funds. AML analysts generate cases from alerts, collect evidence to determine if activity is legal or not, and file reports for suspicious transactions. While AI can help with initial screenings, analysts are still needed to make final decisions as AI cannot replace human judgment. The document discusses how banks use AML processes and technologies but also notes the challenges analysts face in balancing thorough investigations with workload pressures.