A good friend of ours is a code enforcement officer in Colorado. Besides parking tickets, they are also the "dog catchers." So they carry treats (to trick a dog into the paddy wagon), pepper spray, give away leashes for those folks who are violating the leash law, parking tickets, ticket writer (I always used a pen, but nowadays everyone has some fancy ticket writing machine), and no telling what else. Since she often has to walk her "beat," as opposed to driving around, I guess a multi-pocket vest makes a lot of sense...