Huge issue. Both state and federal governments think they're entitled to every cent you've earned, and probably already paid taxes on. Citizens who keep assets in cash or precious metals are right to be scared about the collapse of our banking system, but the government does not want you to protect yourself by remaining liquid. When I worked in Arizona, it was likely that most paper cash was tainted by drug residue, and anytime you were stopped by CBP, a dog could sniff it out, if the agent got too nosey. But officer, "I carry a large amount of money to gamble at the nearby casinos." Sorry, buddy, but you look like a drug dealer. We're radioing highway patrol.
I understand that in some of Lehto's videos, money was seized from safe deposit boxes. There goes that idea for keeping your money in a safe place.
Moral of this story: buy a bloodhound who can sniff out drug money, and exchange bad bills at your local bank. You're innocent, but the money you get at a club may not be clean. Don't comingle new money with old money, until you verify that the new stash is clean.