Maximo Cardoso had never used a crossbow before, but he was intuitively able to assemble the Barnett Raptor FX, a model typically marketed for deer hunting. The field guide also displayed natural marksmanship. So it was agreed: He would be the one to launch the poison. At the base of a sheer rock face amid dry scrub in Bahia, Brazil, decked out in a beekeeping suit, Cardoso took aim at a 45-degree angle, the crossbow loaded with bolts modified to carry glass vials of insecticide. He was targeting small cavities…
