When oats are harvested (in most of North America), they are first killed with glyphosate. This ensures that the harvest time is not left to chance, where a rain storm could ruin it. The result is that most things with oats have unacceptable levels of glyphosate. Even organic oats have been tested to be contaminated.

https://www.leafscore.com/grocery/glyphosate-free-oatmeal-ev...