1. The use of chemical weapons in any capacity that may injure or destroy military personnel, or the environment shall be limited to defensive or delaying operations of aggressive offensive military forces,
This allows anybody to use chemical weapons whenever they want, the same way countries do not respect international treaties or guidelines, the USA coulda used chemical weapons in Afganistan because it was detroying military personnel and could burn the whole thing to the ground to delay Al Qaeda operations. Also Israel can use chemical weapons on Gaza because they feel they're defending their homeland.