Collier (2020) - The Role of Suspicious Activity Reports in AML

Background

The UK suspicious activity report (SAR) regime is the canonical case study in reporting-system failure: hundreds of thousands of filings a year, a few hundred convictions or asset seizures traceable to them, and a system that keeps growing anyway. Collier's empirical work on the UK SARs database documents the numbers and diagnoses the mechanism.

The Numbers

SAR volumes rose for two decades to the hundreds of thousands annually, driven overwhelmingly by banks. Conversion rates to law enforcement outcomes are minuscule by any measure — the paper's analysis of SARs and their downstream use shows the vast majority never reach investigation, let alone prosecution or asset recovery. The filing growth is not a crime wave; it is the reporting system's own dynamics.

Deep Dive

The driver is defensive filing: banks face penalties for failing to report and none for reporting too much, and regulators' thematic reviews push volume as a proxy for diligence. Collier situates this in the wider policing context — the UKFIU and National Crime Agency triage capacity, the consent regime that forces decisions on time-sensitive cases, and the "tipping off" constraints that shape what analysts write. The result is a database whose utility is diluted by its own success at absorbing filings.

Why It Matters

The UK experience generalizes to every SAR/STR regime: quality of the narrative and structured data matter more than count, and enforcement agencies need usable, prioritized intelligence, not more noise. It is the evidence base for the reform argument that reporting regimes should measure outcomes.

Key Takeaways

• SAR growth tracks reporting incentives, not laundering volumes.
• Conversion to action is the only meaningful effectiveness metric; track it.
• Narrative quality and structured fields determine whether an FIU can use a report.