[I called city hall"....]and asked them what the city rules are on metal detecting and they said I can only detect on my own property......REALLY!
In the past I have detected no problem but last week I was told by a cop while detecting in the park that because of other people leaving holes digging was not allowed, I thought maybe the rules had changed .....
2 things:
1) Anytime a cop or gardener etc.... says "no because of holes": Don't be quick to assume there was ever actually any cases of that. It's often-time simply the go-to mental image that a busy-body has, when they see a guy with a detector. It doesn't mean there was ever necessarily any cases of it. And it CERTAINLY doesn't mean a new rule was invented at city hall saying "no detecting".
2) And if you're skittish, you look it up for yourself. Lest you run-afoul of the "easy-answer pencil-pusher" type answer.
The rules on where I can and can not dig.
Oh, well let me save you some time right now then: There is going to be rules for "no digging" in every single town, across the entire USA. Even if not using the word "dig", it will be things like "deface", "alter", "molest", "destroy", etc..... If you think those things automatically preclude you, then give it up now. If you call city hall asking "hi can I dig in the park?", they will OF COURSE say "no".
But if you're not leaving any trace (which , as you saw, seems to the issue that cop had), then presto, you're not running afoul of those things. Sure, maybe he's not convinced. Ok, fine then: Go when he's not there (after lip service and a 2-week "rest"). You're simply not going to get every last person on the earth to love and adore you .