On March 31, 1987, Mario Alberto Salinas Trevino, his brother Baldemar, and two of their Maxican countrymen strolled into Stone Oak National Bank in San Antonio to put $300,000 into certificates of deposit. They had the money in cash, packed neatly in a shoe box.

Bank executives Herbert Pounds and Harlan Vander Zee had gotten a favorable recommendation for Mr. Salinas from a director of the bank. They reported the cash deposits to the government, following all the regulations aimed at preventing money laundering and related crimes.

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