Actually, there's not a single speck of public land in the USA (yes, even beaches) that this ^ ^ same thing couldn't be said. Yup: All city, county, state, and federal level. Even if it doesn't use the word "dig" or "digging", it will be some verbiage like "alter", "deface", "destroy", "injure" or whatever. It's always there in the boiler plate verbiage, at every single park, of every single level.
So ask yourself : Why is it then that we see daily show & tell of people who (gasp) hunt parks ? I mean, presumably they're digging their target, eh ? Are we all just lawless miscreants ? No. Here's why :
All such language is IMPLICITLY referring to the end results. So if you cover your spot, stomp it, and fluff it up, THEN PRESTO: You have not alter
ED, destroy
ED, injur
ED, or defac
ED anything. Now have you ?
And yes I would apply the same logic for d
ig versus d
ug. It's just that we don't spell it as past-tense "digged".
I'm sure that if you went into city & county offices asking for permission or clarification, asking "Can I ?" questions, that you'll invariably find someone to tell you "no". In which case : You are now the latest victim of "No one cared UNTIL you asked" club.
Same for in-the-field : Not everyone is going to agree with those semantics. Because, sure, our hobby carries connotations (that you might be about to leave a hole). Then you go at lower traffic times, and avoid such lookie lous. Presto, problem solved.
Shadowbox, I don't know what you mean by "draconian" rules/laws where you're at. Are you asking "Can I" questions and being told "no" ? If so, that's the wrong way to go about it . You will simply be the subject of the "easy answer" (from someone who envisions geeks with shovels). Instead: Look up in the city muni code FOR YOURSELF. And if nothing there said "No md'ing", then presto: Not prohibited. There's hardly a single city & county now, in this digital day & age, that doesn't have their park rules, muni codes, etc.... on-line.
Just avoid obvious historic sensitive monuments. And don't be "waltzing over beach blankets" at archie conventions, and you'll be fine.