I don't sell drugs so I have no reason to risk large sums of my $$$ by carrying it around in cash.
Bought a new car two years ago ~ $20K, paid by check not with drug $$$
I always carry enough cash to buy a motorcycle that has a really good price. Private sellers don’t take checks. Even checks that appear to be from a bank are easily faked. I have a few prized examples sent to me by ebay and Craigslist scammers. Fake bank checks, fake postal money orders and fake Walmart money orders are common.