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Investigating corruption is at the soul of journalism; shining a light on the shady intersection between business and government where public funds can slip through the cracks.

It needn't even be government related, as the recent scandal of energy price comparison sites promoting companies that pay more commission has shown.

On the Media Helping Media blog, experienced investigative reporter Don Ray details his top ten tips for investigating corruption – from "plotting the geometry of bribery" to determining the "currency of influence".

And remember: it may not always be backhanders and brown envelopes. Any abuse of power is classed as corruption and should be treated as such.

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