account opening documents and account statements are examples of supporting documentation that can help the law enforcement agency to verify the identity, profile, and activity of the customer involved in the suspicious transaction. These documents can provide useful information such as the customer's name, address, date of birth, identification number, occupation, source of funds, transaction history, and beneficiaries. These documents can also help to establish the baseline of normal and expected activity for the customer, and to identify any deviations or anomalies that may indicate money laundering, fraud, or other criminal activities.
References:
* Suspicious Activity Report Supporting Documentation, section "What Constitutes Supporting Documentation", paragraph 2: "Supporting documentation may include, for example, transaction records, new account information, tape recordings, e-mail messages, and correspondence."
* Documentation Requirements: Suspicious Activity Report Supporting Documentation, section "SARs Documentation Requirements", paragraph 2: "Keep all documents with evidence of the background, the purpose of the transactions, the trigger, the investigation carried out, and all findings and conclusions."
* BSA/AML Manual, section "Assessing the BSA/AML Compliance Program - BSA Compliance Officer", paragraph 3: "The BSA compliance officer is responsible for ensuring that the bank's BSA
/AML compliance program is implemented effectively, including timely updates in response to changes in regulations or business activities, and for managing all aspects of the BSA/AML compliance program. The BSA compliance officer is also responsible for ensuring that the bank's BSA/AML compliance program is communicated to all personnel and that adequate training is provided to appropriate personnel."

Reference: https://www.fincen.gov/resources/statutes-regulations/usa-patriot-act

Reference:
http://www.qfcra.com/en-us/whatwedo/AntiMoneyLaundering/Documents/Guidance%20on%20Correspondent% (7) P/6, Wolfsberg Anti-Money Laundering Principles for Correspondent Banking 2014
https://www.wolfsberg-principles.com/sites/default/files/wb/pdfs/wolfsberg-standards/8.%20Wolfsberg-Corresp

A customer who is the brother of a prominent member of a foreign judiciary is considered a politically exposed person (PEP) or a family member of a PEP. PEPs are individuals who hold or have held positions of public trust or influence in a foreign country, such as heads of state, senior politicians, high-ranking military officers, judges, or executives of state-owned enterprises. PEPs pose a higher risk of money laundering, corruption, or bribery due to their access to public funds, influence over policy decisions, or connections to other powerful individuals. Therefore, financial institutions are required to perform enhanced due diligence (EDD) on PEPs and their family members, as well as monitor their transactions and activities more closely.
EDD is a set of additional measures that go beyond the standard customer due diligence (CDD) to obtain more information about the customer, such as their source of wealth, source of funds, expected account activity, business relationships, and reputation. EDD also involves conducting ongoing reviews and updating the customer risk profile regularly. EDD helps the financial institution to mitigate the risks associated with PEPs and detect any signs of money laundering or other illicit activities.
References:
* ACAMS Study Guide1, Chapter 2: Compliance Standards for Anti-Money Laundering (AML) and Combating the Financing of Terrorism (CFT), pages 51-52
* FATF Guidance on Politically Exposed Persons2, pages 9-10, 13-14, 17-18
* Wolfsberg Group Guidance on Politically Exposed Persons3, pages 2-3, 6-7