Final answer:
DEA Form 222 is utilized for ordering Class II controlled substances such as morphine and euthanasia solution, ensuring the regulated handling of such medications.
Step-by-step explanation:
The DEA form that is used to order Class II drugs, like morphine and euthanasia solution, is DEA Form 222. Controlled substances such as opium, heroin, fentanyl, oxycodone, Vicodin, and methadone fall into the category of drugs that necessitate the use of this specific form due to their potential for abuse and dependency. DEA Form 222 is used to ensure proper tracking and monitoring of these substances and is a critical component of regulatory compliance for entities authorized to handle these medications.