DNRs need to be on duty to stop animal waste. Animal waste is a problem not only in the United States but other territory as well. Australia has a major problem with controlling the culling and subsequent waste of kangaroos. The DNRs have a duty to stop animal waste worldwide.
No, there do not need to be more DNRs on duty to stop animal waste, because DNR laws are enforced well already. The DNR enforcement that is already in place does a fine job of regulating the environment. With more, more people might receive tickets, but that would not do anything to affect the ecosystem, which is already appropriately maintained.