It has been used as a
medicinal in the past, but the dosage between useful and toxic is so close that it is too dangerous for a lay person to use for anything.
I cannot find that it has any uses, but if you are in one of the states that considers it a noxious weed, your county may fine you for not eliminating it, and then charge you for having to send their Noxious Weed Killer People in to take care of it.
If you're attempting to control it by mowing, cut it as low as you can get away with, and you'd best keep after it constantly (one mowing isn't
enough), and don't let it flower or go to seed, or you'll just have more. Ignoring a noxious weed like this and letting it reseed is one of the Big Stupids that some farmers perpetuate.
Pulling it out is usually most effective, and you don't even usually have to get all the
root. It is an annual plant, not a
perennial that lives from year to year.
Check your fields every spring, esp after a good rain, or when the soil is wet, and it's much easier to pull up, usually slipping right out of the soil.
Just remember to dispose of the plants, as they remain toxic for a long time, and if an animal eats it when it's dry, it's still toxic. It's probably one of the few things I won't add to my
compost pile. Bag it and get rid of it completely. Sure, it will probably break down eventually, but if a horse or cow or goat gets hold of it, the cost has been much higher than its value in a compost pile.
Sue