From what I've seen, the Catalans (and the Spanish), adopt the old adage that "Rules are for the guidance of wise men and the adherance of fools" and they practice that philosophy with gay abandon.  In fact, I think they view it as a sport.  (I'm liking it :-) I can't imagine the day when you won't be able to buy herbicide from somewhere and that the weed police will be doing regular inspections of your land.
Have you ever seen a Spanish builder/labourer wearing protective gear ?  Saw a programme the other night (might have been Coast) where a tractor driver dragging a sprayer was wearing a mask inside a closed cab.  How often have you seen that here ?
Sore point, but what about the legislation on the protection of animals ?