No direct evidence as far as I know (definitely none for glyphosate, possibly for Roundup) but that’s why Monsanto/Bayer publishes precise usage instructions, a

No direct evidence as far as I know (definitely none for glyphosate, possibly for Roundup) but that’s why Monsanto/Bayer publishes precise usage instructions, and such risk would be based on dosage and wearing of appropriate PPE (= e.g. gloves). In other words: Any risk would be hardly unavoidable.