half-step, I have heard of this technique, for people who feel they MUST talk to a live-person, to ask it in that fashion. Rather than say something like "Can I metal detect?" (which merely puts it up to some clerk's whims, feelings, interpretation, etc....). So instead of asking "Can I metal detect?", the person would ask: "Is there anything that prohibits metal detectors", or "is there any mention of metal detectors anywhere in city muni codes?", etc.... The idea being: that this puts the burden of proof on the desk clerk to PRODUCE such a statute (if one existed, which there usually isn't).
While I can see this working sometimes, I have also heard where it back-fired on people. For example: Someone can answer by saying: "Yes, there's a prohibition on metal detecting, since you can't dig or deface". Notice in that example, the asker NEVER EVEN MENTIONED "digging" or "defacing", etc... But go figure, the person hearing just subconsciouly mentally went to that "image". Or the person answering one time told the guy "we would prefer you didn't" (as if he'd just asked their "opinion", not about actual "law"). When the md'r went to object and say "... but where is that written?", it just went downhill from there (to the usual bunk that someone can "morph" to fit your "pressing question").
So here's a better way for those who feel they MUST talk to a live person: Simply ask: "Where can I view the city's laws, codes, rules, statutes, etc.... Like the city charter-type-thing?". You need not mention metal detecting at all. Just ask where this material is available for public viewing. Perhaps they'll pull the binder out from behind the desk (or direct you to which counter or desk it's on in city hall, etc...). Perhaps they'll give you the link where it's at on-line. Perhaps it's at the local library. IT'S GOT TO BE SOMEWHERE available to the public to view. Then simply go look at it, and answer your own question, of whether or not "metal detecting" is listed amongst any possible prohibitions. Presto. That satsifies someone's urge to go talk to a live person, right?