This happened Friday afternoon and they are just releasing the barge today?
Kinda does make you wonder, after all didn't they go around the country looking at all the cropdusters/owners? Surely they'd at least have some bit of an idea since the range on those aren't exactly all that long, plus they had to have come into contact with some kind of air traffic control, unless they did this very locally (by that I mean took off a mile or two away, did it, and landed at the same place or close by).
It's probably some kook, and I hope when they find him they ream him, he should be treated as bad, if not worse than the anthrax hoaxers running around.
EPA will be after him I'm sure ;-)