Counterfeit bills are circulating in Bucks. Most of these bills have been linked to North Korea. The fake bills are almost impossible to detect. Protect yourself. Once you accept one of these, you lose. If you turn it in you will NOT be reimbursed. If you pass it on, you will be suspect to prosecution. The only way to protect yourself is to check your change at the time you accept it. Carry a UV light if you deal with cash.