The NRP is warning local business owners after noticing a rise in the number of counterfeit bills circulating in the Region.
It has investigated 12 incidents regarding fake American money since September and most of them were in the Niagara Falls tourism district.
They were all $50 or $100 bills.
Police say you should be extra cautious while verifying American cash.

Niagara Falls Preps for Ribfest
Hospital Deficits Getting Worse: Report
Man Dies in Lincoln House Fire
Potential Niagara Parks Strike
Man Charged with Possessing Child Porn
Be Wary of Spring Time Scams: NRP
Man Killed Walking Along QEW
Senior Charged with Hate Speech Crime