Revered by the advocates, he did not invent PZP but expanded its use in wild horse herds under the guise of population control.
Some of them make the pilgrimage to The Science and Conservation Center in Billings, which he founded, for training in the handling and use of PZP.
Why would you want to keep wild horse herds in check? Because their land is managed primarily for livestock. You won’t hear that from the advocates or the SCC.
The substance is a federally registered pesticide. Curiously, a pest control license is not required to apply it.
Western Horse Watchers Association 