There is no law restricting cash carried on a person in the US.
There is tyranny when LEO claim it smells like dope so they can seize it.
Corrupt and dog feces character deputies stole 3K of a paycheck from a friend’s son once on a bogus “drug” suspicion once. Because it was out of state and would have taken more money to get it back they simply added to their running tally for the month.
I think you have to show proof of origin on a lot of cash.