Conmen are switching £20 notes for two fake tenners.
Fifteen people have been stopped in the streets in the Littlehampton and Arundel area and have fallen victim to the tricksters.
Each time, the unsuspecting members of the public have been asked to change £20 for two £10 notes.
Later, they discover the £10 notes are photocopies.
Police asked any other victims to call them on 0845 6070999.
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