When you get to CA, you can chime in on the "kinzli" forum. That is the CA specific forum where anything CA / MD related has a specific forum for. There's several San Diego area guys that chime in there. I'm in Central CA (south of San Jose). To get to the main page you need to sign up. But it's easy: just pick a name and a password.
As for the admonition to "ask" wherever you go (inquire of powers-that-be, etc...) oh SURE, of COURSE that will be the advice that commonly gets floated. Afterall..... you "can't be too safe", eh?
Here's a thread I wrote on that subject of the alternative of "asking", that gets floated for the very reasons you cite (confiscations, jail, fines, etc...):
http://www.treasurenet.com/forums/g...why-not-ask-innocuous-public-places-long.html
As for the Jail, fines, and confiscations, you will often find this bandied around as reasons to go asking permission. Yet when you press people for examples, very few are ever forthcoming. When you
do hear of such things, it's usually always someone who was night-sneaking obvious historic monument spots, someone who couldn't take a warning, or a place where he simply had all the necessary tools to have looked it up. Now is there EVER a case of someone hunting an inoccuous un-posted city park sandbox and getting thrown in jail, fined, and confiscated? PROBABLY! I'm sure if you/we looked hard enough, so too would you probably find examples of persons getting roughed up by over-zealous cops
for nothing but a tail-light out! But does that stop you from driving? No, of course not. Because we all recognize those things are RARE exceptions, not the norm.
And actually, re: the example of your friend and the Deleware Water gap: There must have been an actual rule that either forbade persons from being where he was (ie.: a simple issue of trespassing because he was in an area where NO ONE is allowed to go) or an issue of an actual rule "No Metal Detecting" Because in either of those two cases, my admonition of "find out for yourself" would not apply. Because in either of those cases, he could have looked up the rules for himself, and seen.
See? Still no reason or need to "grovel". If you look up in the park rules and laws for yourself, and see nothing that says "no metal detecting" then presto, it must not be prohibited.
What I'm talking about here is not "actual rules", but about st*pid things you can get morphed to you (that I do not consider "rules" against md'ing), like catch-all things like forbiddance of "annoyances", "vandalism" "bothering earthworms", or whatever they dream up to answer your "pressing question". But on the other hand, if there's a real rule saying no metal detecting, or no one can be at such & such place, then those are outside the scope of this topic.
Rules and laws are available on-line at park's dept. websites (at seemingly every city, county, state and fed. level stuff). So it's not hard to find out for yourself.