Thanks for clarifying, Richard. I have seen in my past history (mid 1970’s) as a lawn chemical applicator, great damage to properties with a product called 8 to 1. 2,4D to Banvel(trade name for dicamba), absolutely wiped lawn weeds out but if sprayed in a privacy fenced yard kill everything to the height of the fence. A useful tool but needs to have restrictions. Dangerous in the wrong hands as @cityman can vouch.
Good topic!