Final answer:
Mental experimentation on mentally disabled human animals does not occur due to ethical and humane considerations. Regulations and guidelines exist to ensure the proper treatment of animals in laboratory settings.
Step-by-step explanation:
Medical experimentation on mentally disabled human animals does not occur due to ethical and humane considerations. Animals used in experiments should be treated with respect and protected from unnecessary suffering.
In many countries, including the United States, regulations and guidelines exist to ensure the proper treatment of animals in laboratory settings. Researchers must design experiments to minimize pain and distress experienced by animals serving as research subjects.