Same goes for Florida, you have to be licensed to collect here, as many plants can get "invasive" status in the tropical climate. BUT that is not to say they can enforce that law at all times. I personally pull so much Hygro out of the props/intakes of jet boats and jet skis every year that it is a joke.
Also, dip your plants in potassium permagranite solution or alum to knock off any baddies. Not all plants can take the dip though, so be careful. An Excel dip may work, but I am not sure as I know it will kill Jungle Vals...