I don't know if it's wise to plant by Government buildings, and cop areas. If the press finds out about the plant before the cops do, it will make the cops look foolish, making them crack down harder on those who made them look like fools.
The same thing if they're by schools. who really wants the battle cry "Won't somebody PLEASE think of the children???" shouted through the community?
Plants are cool to be spread, but if people are going to be in an uproar about something, I'm sure most people can agree that it really shouldn't be on something as harmless as a weed.