Final answer:
The DOT hazard class that includes poisons is class 6 which is dedicated to toxic substances and infectious substances.
Step-by-step explanation:
The DOT hazard class that includes poisons is class 6. Class 6 is dedicated to toxic substances and infectious substances. This class includes materials such as poisonous gases, toxic liquids, and infectious substances. These substances are classified based on their toxicity level and potential harm to human health.