I read some of the articles about a year ago from Texas A&M, they didn't sound too encouraging. They were trying to figure out something that would kill Hogs, but wouldn't get in the food chain and hurt other animals.

In the sixties in So. Cal. the ranchers put up pens high enough to keep cattle out, but low enough for a Deer to jump and put poison Corn in there. The idea was to poison the Deer and keep them from transmitting disease to the Cattle. This was going on just on the other side of the mountain from a Condor preserve. It doesn't take a rocket surgeon to figure out what happened, they ended up poisoning Condors.

I doubt poison is the answer.

Traps seem to be the more efficient way to do it.