The name reminds me of something that happened in the 70s involving marijuana.
That was “paraquat”. IIRC, the Mexican government was spraying pot fields with it, to kill the weed before harvest. The Mexican drug merchants then sold it in the US anyway ...
Some homeowner-use herbicides include “diquat”; it’s very effective at rapidly knocking down weeds. Don’t know about weed ... never tried it on that.