We get it here in New Jersey sometimes too. Obviously, State and Federal lands are totally off guards, but, the county parks operate by a different set of rules. 99% of the time, I have no problem in the county parks. However, once and a while, I do have a set-back. My buddy and I hit a park about a month ago. The park policeman (glorified security guard) pulls his truck over and walks up to me. He was very nice, but, he said they normally don't allow metal detecting in the park because.....you guessed it.....hunters dig holes and don't fill them back up!!! I assured him I operate by different standards and even showed him my covered holes and all of the junk I was helping to clean. He then said, "Technically, you're not supposed to be here, but, I didn't see you. Just don't muss anything up." He then gave me a wink-wink and I was good to go. He did make sure to follow us around pretty darn well though
I've also had the coppers called on me in the county parks before too. Mostly from concerned parents or observers. However, I just showed them my I.D. and I was off and hunting again.
Most cops or parks workers COULD CARE LESS what you are doing in the park. As long as you are respecting the land and not messing things up or making trouble. They're more concerned about what they are going to eat for lunch
There is one county park here where I am itching to hit, but, was told by a worker last year they don't allow metal detecting

So, I just found another one.
I'm pretty sure you won't have that problem much, but, it WILL happen from time to time. Just move on
