That's already the case, although not for domestic travelers it seems. See for example https://reason.com/2020/07/30/homeland-security-seized-2-billion-in-cash-

That's already the case, although not for domestic travelers it seems. See for example https://reason.com/2020/07/30/homeland-security-seized-2-billion-in-cash-from-travelers-at-u-s-airports/ https://reason.com/2020/07/30/homeland-security-seized-2-bil...