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On this page:
http://www.nytimes.com/2011/04/18/nyregion/for-passover-eating-quinoa-is-popular-but-is-it-kosher.html
Are these paragraphs from a longer article:

Increasing demand here for quinoa - which can be boiled or otherwise 
prepared in a variety of ricelike dishes - has driven up the price, 
persuading many farmers who grew wheat, corn or barley in Bolivia and 
Peru to plant quinoa as well, said Rabbi Menachem Genack, director of 
the kosher department of the New York-based Orthodox Union, the 
world's largest kashrut certification agency.

And there is the potential rub, Rabbi Genack explained. Some 
inspectors have found traces of wheat, and other grains susceptible 
to leavening in the cooking process, mixed in with quinoa shipped by 
some farmers, he said.

"They may be using the same equipment or bags to harvest a field of 
quinoa, and a field of something else," he said. "Things easily get mixed up."

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