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A police officer from South Wales was left red-faced in front of colleagues after mistaking chocolate buttons for Class B drug cannabis.

According to industry publication Police Magazine, the PCSO was sent to investigate a factory after its HR boss said he had evidence a drug dealer was operating on the premises.

The officer from the Caerphilly Neighbourhood Policing Team seized the 'evidence' and passed it to senior officers in Caerphilly.

The substance was carefully sealed in an evidence bag and labelled as a 'small brown piece of vegetation, possibly cannabis'.

But on closer inspection, the sweet, brown substance was discovered to be a melted chocolate button.

A colleague said: “He’s had quite a ribbing since.”