Pesticides for homeowners are banned including lawn weed control but certain ones are apparently available to licensed professionals. A pro gassed me one day with overspray and evaporation spraying a nearby cedar hedge for mosquitoes but he did put up a tiny sign on the lawn indistinguishable from the Fiesta warning signs. Can't remember the chem used. Talked to the guy and looked it up at the time and wasn't impressed. I'm not licensed so I'm not sure how the professional availability changed, many years ago now. Another time right after the changeover guys were sneaking in banned weed sprays and a guy did 3 yards in a row directly upwind of me - by the time I figured something wasn't right (besides the smell) I felt sick for a solid 3 hours - about 15 minutes exposure. Sorry for the jaded stories. I know guys push their licensed status to bend "emergency infestation application needed" that they report or document as exceptions. Golf courses and cemeteries have exemptions and I met quite a few long time adjacent residents who lost their spouse to cancer - not proof but strong coincidence, in two different neighbourhoods.
PPE!!
I had a senior lady, fussy, who disliked nature, and had a caterpillar infestation in her oak. She sprayed, swatted, scraped etc so much she left a surface damage zone around the trunk of the tree where she could reach. I pointed this out to her and she just looked unfazed. She also paid ?$ for a spray application that barely dented them.
Story telling mood today. Back on the rails!