NASA presidential candidate Raila Odinga. [Photo/Media Max Network].

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Former Prime Minister Raila Odinga has yet again threaten to expose the cartels behind the importation of maize from Mexico.

The NASA presidential candidate said he knows the companies and individual behind the controversial importation and he will soon inform the public who the faceless cartels are.

Raila spoke in Rarieda during the burial of Gladys Onono, the mother of nominated Senator Elizabeth Ongoro and Rarieda ODM nominee Otiende Amollo.

Raila rubbished President Uhuru Kenyatta's remarks that the high maize prices dated back to 2011.

"The price of maize in 2011 cannot affect the same in 2017. That is an absolute lie," Odinga said.