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The BSA is an even bigger threat to the Fourth Amendment. Americans do not have to communicate with a foreign person or suspected terrorist to be wrapped up in BSA surveillance. People get wrapped up in BSA surveillance for simply spending their own money.
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... Few realize it, but Fourth Amendment protection against warrantless searches no longer applies to Americans’ financial records.
It’s true. The BSA and the massive federal anti-money laundering framework that it spawned gives the government warrantless access to the financial records of any American with a bank account. (Actually, it’s not just banks—the rule applies to transactions with all “financial institutions,” broadly defined as companies ranging from jewelers to casinos.) And financial firms have been commandeered as an extended arm of law enforcement—they now report millions of customers’ transactions to the federal government every year.
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More:

The Bank Secrecy Act Is A Bigger Threat Than FISA
It turns out the federal government has conducted tons of these warrantless searches—more than 200,000 in 2022 alone—of Americans’ phone calls, emails, and texts.

TPTB have gotten a taste of the power that a CBDC will yield. The war on cash will continue to herd people into using easily monitored digital money unless people start demanding real money.