A law expert says it's important for the Māori Development Minister to look at contracts - to figure out where Whānau Ora's money is coming from. 

Tama Potaka is seeking a review of a recent Whānau Ora ad campaign encouraging Māori to sign up to the Māori electoral roll. 

He says it would be inappropriate for public funding to be used for electioneering. 

Law expert Graeme Edgeler told Mike Hosking the law isn't complicated about this, so long as the money is coming from the right place. 

He says this is Whānau Ora's commissioning agency which is private, and can spend money how they like, as long as it is their money. 

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