Police in Rochester, New Hampshire, are working with the Secret Service to try to determine the origin of counterfeit $20 bills that have been found in the area.

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Police said the counterfeit currency looks and feels like regular $20 bills, but the back-side has been printed upside down.

Police are asking shop owners and customers to be on the lookout for counterfeit bills when exchanging money.

There is nothing suspicious about 'Win Cash with the Shark Bank' however.

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