Gunshot shall not be used as a routine method of euthanasia in animal shelter settings. This prohibition shall not apply in animal shelter settings if an animal presents a threat to the health or safety of anyone lawfully on the premises of the shelter. The prohibition against gunshot shall also not apply to peace officers or animal control officers outside animal shelter situations if an animal:
(1) Cannot be seized;
(2) Presents a threat to the health or safety of the general public; or (3) Has an injury or physical condition which causes the animal to suffer.