Currently any individual, American or otherwise, is considered guilty until proven innocent with regards to large amounts of cash. The definition of "large" is variable: to the Federal Government, anything around $10,000 is "large" and having possession of $10,000 of cash without an explanation that satisfies the police and courts opens a US Citizen to seizure--the Citizen is considered GUILTY of a crime BECAUSE THERE IS NO EVIDENCE OF INNOCENCE.
Tennessee state police will seize all money if a US Citizen is found with over $100 in any situation. Alabama, $500. Again, having money equates to guilt.
Repeal the relevant Federal statutes and call for the states that practice these inane behaviors to reform these laws as well.