This guide handles pesticide compliance and pesticide litigation from both sides. It begins with the provision that makes the label an operative legal instrument rather than a warning, and with the label architecture that a practitioner must be able to navigate in under a minute. It works through registration and its cost-benefit standard, the preemption provision and the two-part test that determines which state claims survive, applicator certification and supervision, and the worker protection standard whose restricted entry interval generates most violations. It covers tolerances and the separate health-based standard governing residues, the water permitting and endangered species obligations that have become the binding constraints, and drift claims including the state investigation file that decides most of them. Separate sections address non-agricultural uses, insurance coverage and the traps in it, state divergence, and the compliance systems this field now requires.