I wouldn't know about the specific situation in the USA but here in Europe(EU or not), cash seizures happens at the borders all the time and the due process is that you need to be able to explain the origin of the money.
It is a popular theme for Turks working in Germany having their cash seized by Serbia on their way to a vacation in Turkey. This is because, the Turkish diaspora in Germany is predominantly blue collar due to the nature of their immigration(long story short, many years go Germany requested workers for their factories, many Turks took the opportunity) and they have a lot of opportunities to deal with cash and not pay tax on it.
Essentially, Turks who do "tax-free" business buy properties in Turkey and there's a common fraud to claim benefits because on the books they look very poor, so they definitely don't want that money to go into the books and the Serbian police apparently caught up with it.
Anyway, the fraud is about to be solved not by seizure of assets but by data-sharing agreement between EU and Turkey, the Turkish banks and the state will report the properties and assets to EU&UK for anti fraud purposes. There are many pissed off people about it.
It is a popular theme for Turks working in Germany having their cash seized by Serbia on their way to a vacation in Turkey. This is because, the Turkish diaspora in Germany is predominantly blue collar due to the nature of their immigration(long story short, many years go Germany requested workers for their factories, many Turks took the opportunity) and they have a lot of opportunities to deal with cash and not pay tax on it.
Essentially, Turks who do "tax-free" business buy properties in Turkey and there's a common fraud to claim benefits because on the books they look very poor, so they definitely don't want that money to go into the books and the Serbian police apparently caught up with it.
Anyway, the fraud is about to be solved not by seizure of assets but by data-sharing agreement between EU and Turkey, the Turkish banks and the state will report the properties and assets to EU&UK for anti fraud purposes. There are many pissed off people about it.