A woman was arrested for trying to pass a counterfeit $50 bill to D.A.R.T. on Cherry Street on Tuesday.
The woman, whose name hasn't been released, says she got the bill from a nearby gas station.
The attendant knew it was fake by the feel and faded color, and the pen test confirmed it.
The bill was taken by Des Moines Police for evidence.
Windsor Heights Police reported several counterfeit $20 bills passed at garage sales over the weekend.