The search covered about 2 acres surrounding the pond. The investigators noticed that grass surrounding nearby power line pole was wilted and discolored. They speculated that a herbicide might have been used on the grass. A common ingredient in herbicides is arsenic in any one of a variety of forms, including arsenic trioxide, sodium arsenite, monosodium methanearsenate, and disodium methanearsenate. The last compound is the disodium salt of methanearsenic acid,White-tailed deer have proliferated in many parts of the country.