Actually the data is pretty clear in study after study that no removal technique has any long-term impact on coyote populations. Short term, some impact. Long term, none. 50% of coyotes that cross a given property are transitory (they do not live there). So half the coyotes removed aren't going to be residents. Take out the residents and they are rapidly replaced by transitory coyotes that find an open habitat niche (few residents). Again, you can make an impact for a month or two. Long-term, no.