Waupaca Police Chief Tim Goke is advising area businesses to be on the lookout for counterfeit bills.
Fake money continues to be discovered at retail stores throughout the state.
Among the confirmed counterfeit bills are $100 bills with serial numbers AE57456080C and KL25138750A, $50 bills with serial numbers CF06285234A and $20 bills with serial numbers 1D72030389B, JE32422254C, 1D27174069B, 1B79466761E and JK81846191A.
The Waupaca Area Chamber of Commerce advised going to www.secretservice.gov/money_detect.shtml – for information on how to detect counterfeit money.
In Waupaca, detecting pens may be purchased at Office Outfitters, the Chamber said.