If you spend time in casinos you notice the counting money differences. There are also occupational differences, and differences in how wallets are used, back

If you spend time in casinos you notice the counting money differences. There are also occupational differences, and differences in how wallets are used, back pocket vs front pocket vs top pocket, if money is taken out of a wallet or counted inside the wallet, if money clips are used, if the money is folded etc. I sat at a poker table once with a guy who could swear he could spot drug dealers and money launderers by the way they fold and count their money by counting the roll out and also throw money vs placing it when putting it on the table