Yo, this sounds legit! I'd be down! Maybe:

1.) A Sheriff's badge is--upon closer inspection--etched with runes that protect him or her from basic, low-level spells (scrying, fire, and maybe offers bullet deflection?)

2.) Maybe there are specific rangers for specific situations? Magic, monsters and so forth.

Either way, I'd be down for something like this! I have an enchanted cowboy sitting around somewhere I'd like to give a whirl if I'm chosen!