Can you get in trouble for unknowingly using conterfeit cash?

For example, let's say you get change from walmart that was conterfeit but didn't know because you would trust that they would use real money. In addition, they got the money from a customer but they didn't check it was real. You go and deposit the money at the bank at walmart and they find the money isn't real. Would you get into trouble if you can prove that you didn't know?