The Controlled Substances Act prevents harmful things.
A controlled substance is a drug. There exist both harmful and beneficial controlled substances. If a child is exposed to a controlled substance, he or she is in chemical endangerment. Chemical Endangerment is harmful.  The Controlled Substances Act was an act passed in 1971. Some Acts prevent harmful things.
∀x (ControlledSubstances(x) → Drugs(x)) ∃x ∃x (ControlledSubstances(x) ∧ ControlledSubstances(y) ∧ Beneficial(x) ∧ Harmful(y)) ∀x ∀y (ExposedToControlledSubstance(x, y) → ChemicalEndangerment(x)) ∀x (ChemicalEndangerment(x) → Harmful(x)) PassedIn(controlledSubstancesAct, year1971) ∧ Act(controlledSubstancesAct) ∃x (Act(x) ∧ PreventsHarm(x))