If you are a farmer, you know the corn you are gowing is GMO because you buy seeds that are known to be GMO. If you are gowing non-GMO varieties, you do not know if GMO vaieties have cross pollinated with your corn unless you get it tested.
If you are a consumer, you do not know if the corn or processed foods containing corn is GMO unless it is labeled as such. In the United States GMO foods are not labeled.
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Since at least 70% to 80% or more of the corn grown in the United States is GMO, it is likely that HFCS (high fructose corn syrup) sold in the U.S. is GMO.
A non-GMO is an organism that has not been altered in a lab with a gene from an unrelated organism, such as corn that has been altered with a gene from a bacteria.
Corn, rice, everything
Some is, some is not. If one is looking for plain corn meal check or contact the specific brand. If the corn meal is an ingredient in a prepared food contact the specific brand. Any that is organic is not gmo.
The insects could grow resistant to the pesticide in the genetically-modified corn and become immune to regular pesticides.