They are worse than you can imagine, at least from my anecdotal experience. Someone I know is a teacher and wanted to do clean up invasive plants overtaking some parts of the school grounds with kids, as a field trip for Environmental Science where they were studying invasive species. Alas, they cannot do that because the union of whoever is supposed to do that will not allow it. Only they can do it. Of course, they themselves haven't done it in years and have no plans to start.