This has always confused me over the years, We've used a pest controller for years where I worked , I've always asked why they dont use guns , Was told its not quite as simple as shooting pests, Apparently shooting should be a last resort, preventing them access or removing food source etc etc. The norm on most shooting forums is have permission and kill anything. Hey like I said , I've had conflicting info. Dont know myself but hopefully someone can clear it up with the right info.