Well I've never liked the idea of RU being sprayed on grains as a pre harvest burn down.   I have to believe that some of the glyphosate has to be absorbed into the kernals and is then passed into the food chain.    I've always felt no chemical should be sprayed within 60 days of harvest.   I think well over half the wheat crops in our area get a heavy dose of RU 10 days before harvest.   JMO.