The new weapon on Leeds' streets
West Yorkshire Police's Roads Policing Unit tweeted a picture of the hidden blade after discovering it in the possession of a detainee.
Officers who successfully completed a search of an arrested male labelled the device 'a credit card knife' - which could do "serious harm".
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Hide AdHowever, a quick search of Amazon reveals that the gadgets are sold legally on the internet giant's US site.
Although they do not ship to the UK, the Holtzman's credit card knives are priced at just under ten dollars and are marketed as the 'best wallet knife' to be used in outdoor survival situations.