Most don't have the portrait on the right side of the bill...

Most don't have the portrait on the right side of the bill that is seen on genuine currency when it is held up to the light. When the portrait is in place on the counterfeit money, it is usually of poor quality. In some instances, when the bill was taken by a person with wet hands, the ink smeared. Some of the serial numbers used have been the same, with some businesses unknowingly taking several counterfeit bills at one time, all of them with the exact same serial number,