Two people, a 21-year-old man and 19-year-old woman, have been arrested and face charges of Uttering Counterfeit Currency.
Saint John Police say funny money was allegedly being passed at stores in the city and they are warning shop owners to keep an eye out for them.
They are said to be very poor copies of US $100 bills on thick paper with a specific serial number which is B17696366 .
If you think you might have been slipped one of these bills you are asked to contact Saint John Police.