in most cases , when it comes to detecting small towns,
the words legal & illegal depend on the mindset of the person who sees you.
most small communities haven't seen anyone detecting, except maybe someone they can look at and say
"oh I know him"
small cities pretty much the same, with one difference some have a police force,
and some police make their own rules, but small cities are usually open.
Big cities usually have dept. of recreation. & some of the people on the recreation committee get power trips
and may have pushed something thru. or,
may have tried to and failed.
these are the ones who will approach and tell you it's illegal, because one way or another they
feel they are going to control what recreation goes on there.
Bottom line read Treasure_Hunter & Sandman's posts,
and google the town to see if it has a website & recreation rules,
if the park has a sign giving hours & rules, follow them.
when I see a sign that says the park is created for recreation,
and it doesn't say no detecting or no removal of artifacts,
I recreate
if County or State parks I'm more carefull
Bottom line,
1. If asking permission, Never ask if you can remove things from Park property.
trash and digs are not park property. you know better then to remove the backsop on the ball field
see saw or picnic tables right ?
2.
If you feel you must ask , Never ask if you can Dig in the park. I don't "dig" I "retrieve"
ask if you can detect.
3.
if your unsure if park is church, public, or private; instead of asking can you detect,
ask if it is open to the puiblic. if I get yes I thank them and have at it.
4. if asked how deep it goes by a park official "couple inches"
Good Luck !