Does anyone know anything about gardening?

With glyphosate, I believe (from the chats I had with the JKW guy who I was dealing with at my last place) the issue is long term or regular exposure without proper PPE. Because Monsanto and the like probably lobbied for it to be downgraded in toxicity (or whatever the term is), people would just splash it about all over the place. I think there was a case where a groundskeeper for a school or college was able to win a case where it was determined that it was the cause of their cancer. Since then it has had more media coverage.

But as @Grumpy_Git says, there are chemicals we probably use everyday that are more carcenogenic. Glyphosate breaks down in the soil eventually and is not seen as likely to enter the water table because it binds to the soil. What it will do is totally fucking annihilate any plants it touches. When we had the JKW treated, there was a perfect circle of scorched earth around each plant, but the grass came back in the next year or so. The JKW tried to come back too, but it was definitely much weaker and eventually gave up and went dormant.

Use your own discretion, but if you do use it, glove and mask up, especially if spraying. The JKW folks were fully hazmat suited up (but then they do it every day) but said we didn't have to be too wary of the area around the treatment but to give it a bit of space for a week or so. If anything because disturbing JKW can actually kick it back into life again.

I still have an unopened bottle of it in the shed that I panic bought when I first discovered the JKW, never used it. For the brambles and ivy here I pulled it all up by the roots as much as possible. Some of it still pops up from time to time but I'm maybe only now pulling one up every other week or so. Down from about 60 square meters of shoulder high bramble and ivy running all over the place like cables under the whole lawn.