I did ask the principal at my son's middle school and my other son's elementary school if I would be able to metal detect the property. I did tell them both that it is public land, but out of respect, I just wanted to ask. I received very happy "Of Course You May!" I DO NOT DETECT DURING SCHOOL HOURS!
I did however, have restrictions (at the middle school)....they asked me if I would not detect on the ball fields. There concern was a safety issue, which I can understand. Making holes and covering them up...may cause a depression in the ground, which in turn may cause a student to trip during a game with possible injury. So, I agreed to that. I told them I wouldn't detect around the landscaped areas around the building and the middle school principal told me..."Oh, that's ok....go for it." (I was like OMG!!! REALLY?)..and I have too!!!
Those are the only two schools I have done so far. I have a high school up the road that I plan to detect soon.
And I was one of those people who called the CITY OFFICE to ask about my cities metal detecting laws. I was told that there are NO LAWS against metal detecting in my city, all city owned/public property was open for detecting, just respect the land and cover your holes. That includes doing the sidewalks, even the mediums in the road (which they recommend I don't do, as the cops may stop me for safety issues!)
I had one problem at a CITY PARK/COMMUNITY PARK (which is in my own neighborhood, I can see the park right now out my window...that's how close it is!! I'm 3 houses from the park!)...so I called both my city and another cities person in charge of all the parks and both have given their blessings. I told them that I do genealogy of the area and am currently writing a book on the people of Hampton Roads up to 31 December 1999. That I metal detect in hopes to finding history of the people that worked and lived on these lands. Both of these individuals thanked me for asking and wished me luck. They asked me to let them know if I find anything interesting. I told them I would, which I have called them back several times on finds. I am trying to find one location of a poor house, which is now a city park. Infact, the man in charge of another cities parks even told me of all the wonderful finds others find at one of his parks. And they both have told me that if I should run into any problems, to please tell the individual to call them! Infact, the lady incharge I spoke with for my cities parks...even told her grounds folks that if they see a lady metal detecting (me

)...that it was ok!
So, it's that MURPHY'S LAW thing, "Dang if you do and dang if you don't". I think also, it's how you approach the individual. I don't know if my writing a book had anything to do with it (which I am writing...that is very true!)....but I relate all my metal detecting to genealogy, because that is why I metal detect!!! And I have conteplated....going back to school for archealogy classes, not so much the degree....but just to take courses to get a better understanding of the field.
Also, I personnally don't care to hold on to items that may be related to these particular schools, i.e., like the horseshoe I found, etc...so I am making shadow boxes for each school and putting in the items and also writing a paper on the items, where and when they were found....and if any history pertains to any of these items. So far, not really much on the history part, but some interesting items ...and I am even including a bit of trash ... yes....to teach the kids why they shouldn't be litter bugs!
As for that old drive in...you can go to the court house and see if they can look up who owns the land now. Also, try going to your local library and see if your newspaper is on reels. You may even want to search the newspaper on the movie theater...it's a tedious and time consuming process, but you may also find other wonderful history tidbits that may open new avenues to detect!!!
Good luck to you...and as I said, it's that Murphy's Law thing....Dang if we askand dang if we don't!!!
Happy Hunting,
Annmarie