Home gardeners are NOT allowed to use RoundUp in Metro Toronto, Canada.
The city of Richmond, California, has banned the use of glyphosate (RoundUp). "WHEREAS, there is documented evidence that exposure to glyphosate causes birth defects, fetal deaths, cancer, DNA damage, and other serious illnesses;" City of Richmond Pesticide Ban
In the midwest US, soil treated with RoundUp is deemed safe once it has dried.
Monsanto (makers of RoundUp) are very influential, so FDA and USDA may not be using only "science" to come to their decisions. 😧
See https://rounduprisks.com/glyphosate-pdf-library/