Banks, shops and restaurant owners are being asked to look out for counterfeit £20 notes.
Police in Telford say they are aware that there are a number of forged Scottish bank notes in circulation.
Officers say people should check the clarity of printing - there should be no blurred edges and colours should be clear on both sides of the note.
The watermark should also be clear and visible only when held up to the light, and the note should feel crisp.
Anyone who receives counterfeit currency is being asked to note the description of the person who gave it to them and the details of any vehicle involved.