I don't live in the US so don't really care, but if I did I would be sad if I can't grow guerilla anymore without every bud getting seeded by random feral weed.
on the other hand, I may have already done something like this at one spot by accident, I had one guerilla-spot for making seeds, when I first visited to see if they were ready they were full of seeds, but all the seeds were still green. when I returned a few weeks later, almost no seeds were left, the birds had discovered them.
but I think there's a good chance some fell on the ground, so I'm going to check later this year if there are any seedlings growing there.