Which action should CBP officers take when currency declarations appear unusual or large?

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When currency declarations look unusually large or suspicious, the action is to flag them for risk assessment and further inquiry. This reflects the purpose of currency reporting: to detect potential money laundering, illicit finance, or other violations and to ensure compliance with reporting requirements under the Bank Secrecy Act. By flagging, officers can verify the amount and source of funds, request supporting documentation, and determine whether additional steps are needed, such as filing a currency report with FinCEN or involving other law enforcement. This approach preserves safeguards that prevent illicit cash from moving freely and helps ensure travelers are compliant with the rules. Ignoring the declaration, declaring everything as tax payments, or letting currency pass without review would skip essential checks and undermine those safeguards.