I thought of an idea or two back when this issue was discussed a dozen times earlier. I think I finally have a winner. Corks. Everyone will be issued a cork at the interagency center. It will be dutifully inserted at the portal and we can hire a couple of special rangers to check for compliance.
reminds me of a joke about a pig a cork and three monkeys. Or is it three pigs and a monkey? I never remember the details to jokes.