USA Patriot Act

Reports relating to coins and currency received in nonfinancial trade or business
“Any person -- (1) who is engaged in a trade or business; and … receives more than $10,000 in coins or currency in 1 transaction (or 2 or more related transactions), shall file a report … with the Financial Crimes Enforcement Network [including] the name and address … of the person from whom the coins or currency was received” 31 USC §5331
Immunity for reporting “suspicious activities”
Immunity for including “suspicions of illegal activities in written employment references”

Reports relating to coins and currency received in nonfinancial trade or business