I figure they must have a commercial "applicators license" to use
herbicides. Who issues that license?

The *******s treated my neighbor's back yard last week, and they sprayed
2,4-d through the fence and into my vegetable garden. I recognized the
twisted new growth as being herbicide damage before I even found the
little ChemLawn sign in their front yard.

While I was writing down the phone number from the little sign, another
neighbor came by and said he's complained to ChemLawn before about them
leaving Weed-n-Feed granules all over the sidewalk when they were done.

Bob