Ever heard of 2, 4-D herbicide?

An old herbicide introduced in 1940s That grows wide leafed plants to death. Interesting stuff. Dad has to go to this herbicide thing when he renews his license. Apparently something that's good for corn, is used in meth. And said criminals will open the canisters of the stuff to steal the stuff, and kill miles worth of foliage from doing that after stealing. Anywho. Stuff...