Absolutely! Even assuming that they work, and that they only kill the intended target (already proven false), you're throwing cyanide around - on the ground, a

Absolutely! Even assuming that they work, and that they only kill the intended target (already proven false), you're throwing cyanide around - on the ground, and potentially in the groundwater and surface water. If somebody did that on my land I'd be like "Have you lost your mind?" Well, the good news is, it degrades and has a half-life. The bad news is, it has an other-half-life.