24D is a great broadleaf. Legal in most states. But I prefer vinegar, soap, and salt to use as a spray to kill weeds. Then spread enough salt out there once dead to realt hinder rhe growth. It's legal because if is natural.
Otherwise, illegal opportunities are mixing kerosene, diesel, burned motor oil, with a little bit of fire.
Here is music for people who like weeds. They have terrible taste.