Why shouldn't someone be able to place these on their own property? Sure it creates a coyote vacuum but by definition said vacuum has less coyotes in it than the surrounding area. You then only have to deal with the ones that show up rather than an entire population. These seem useful for people who raise chickens and other small livestock that would be very attractive to coyotes. Obviously they need to be used carefully, like anything else that's designed specifically to be poisonous but these seem safer and more targeted than leaving out a dead varmint that's been laced with poison.