I was at the mall this morning and saw a company spraying there too. Have to say it did smell a lot like 2,4-D, I still have some lying around in my garage. As for the law I'm not sure... wouldn't make much sense for a licensed applicator to not be able to use it, while anyone with limited experience can. I had a friend who tried to by some at Canadian Tire and they told him if he's going to use it on his lawn they can't sell it to him. If it is true that they are using than that's wrong...