Does anheuser-busch use genetically modified grains in it's beer?

Yes and No. All of their Beer made in the USA contains GMO rice, GMO corn syrup and GMO corn. The Beers produced outside the USA do not allow GMO so if you want your Bud GMO Free, do not buy it in the USA or Canada where the governments protect Monsanto, just buy it in Belgium or Germany where they have made GMO illegal... and for good reason.