Final answer:
Informed consent may be given under specific circumstances, by any of the following EXCEPT a person under the influence of drugs or alcohol.
Step-by-step explanation:
Informed consent may be given under specific circumstances, by any of the following EXCEPT a person under the influence of drugs or alcohol. Informed consent is the process of informing a research participant about what to expect during an experiment, any risks involved, and the implications of the research, and then obtaining the person's consent to participate. It is important for individuals to give their informed consent willingly and to be in a state where they can understand and make decisions.