How much of those counterfeit bill circulated in the market already?

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There were several incidents I heard from friends, and at work, they found counterfeit bill or reported counterfeit bill from customers. It is absolutely scary thing to consider. We can't detect whether a bill we are holding is a real or not with our eyes. We need tools for help to determine the result. Rule of thumb, never carry bills bigger than $20. I heard a story about a guy who cash out a money order with $800, with 8 of $100 bills for easy to carry. He used one of the bill in a local gas station for purchase. The gas station found it to be a counterfeit bill and call the police. Although he knew nothing about it, but he take the responsibility for circulating the bill. Once you accepted a counterfeit bill, the responsibility is yours as stated by the law. You pass it on to others. Although you can explain your way out, the chance is that you might lost big money, like the instance above.