This is when a customer or a transaction does not provide sufficient or credible information about their identity, source of funds, business activity, or purpose of the transaction. Lack of transparency can indicate that the customer or the transaction is trying to conceal the origin, ownership, or destination of illicit funds, or to evade regulatory scrutiny or reporting obligations. Lack of transparency is a common risk factor for money laundering and terrorist financing, especially in high-risk jurisdictions or sectors.
The other options are not necessarily red flags, although they may increase the risk or require further due diligence depending on the circumstances and the risk profile of the customers and countries involved. Option A describes a referral by a longtime friend of the dealer, which may be a legitimate source of trust or business relationship, but it does not substitute the need for proper customer identification and verification. Option B describes the location of the precious metals dealer, which may be a high-risk jurisdiction due to factors such as weak governance, corruption, crime, or sanctions, but it does not imply that the dealer or the customer is involved in money laundering. Option C describes the amount and nature of the transaction, which may be unusual or large, but it does not necessarily indicate money laundering, as long as the customer can provide a reasonable explanation and evidence for the source and use of funds.
Reference:
ACAMS CAMS Certification Video Training Course - 6th Edition1
Exam CAMS: Certified Anti-Money Laundering Specialist (the 6th edition)2 ACAMS CAMS Study Guide - 6th Edition, Chapter 3, pages 64-65
: https://www.acams.org/wp-content/uploads/2019/09/ACAMS-CAMS-Study-Guide-6th-Edition-Chapter-3.pdf