Benefit fraud investigators: the tools of the trade - in pictures

Benefit fraud investigator Graham Smith during surveillance operation in Tunbridge Wells, Kent Photograph: Martin Argles for the Guardian

A can of pepsi used as a covert camera by benefit fraud investigators Photograph: Martin Argles for the Guardian

The camera is place inside an opened can Photograph: Martin Argles for the Guardian

A hole in the word 'saturates' shows where the camera is concealed in the can Photograph: Martin Argles for the Guardian

Benefit fraud investigator wearing a rucksack with a hidden camera in the strap. Photograph: Martin Argles for the Guardian

A camera can also be hidden in a key fob Photograph: Martin Argles for the Guardian

Oasis drink bottle with a hidden camera Photograph: Martin Argles for the Guardian

The dots mark the spot where the camera is concealed in the bottle Photograph: Martin Argles for the Guardian

Woman's handbag with a camera hidden in the strap. Photograph: Martin Argles for the Guardian

The black dot in the bag strap shows the camera lens. Photograph: Martin Argles for the Guardian

Benefit fraud investigator Graham Smith during surveillance operation in Tunbridge Wells, Kent Photograph: Martin Argles for the Guardian