Final answer:
The answer to the question is that (option 1) issuance of a prescription for a controlled substance as part of dental treatment is legal and not an example of a non-legal prescription. Other listed practices, such as issuing false or fictitious prescriptions or prescribing to individuals not under care, are considered illegal.
Step-by-step explanation:
The question you are asking about pertains to examples of non-legal prescriptions, with one option that does not belong to that category. When we talk about non-legal prescriptions, we refer to actions such as false or fictitious prescriptions, drug abuse without medical advice or for reasons not intended, and issuing prescriptions for individuals or animals not under direct care which is outside the bounds of legal medical practice.
Issuance of a prescription for a controlled substance only as part of dental treatment is the correct practice and therefore is the exception in this list, meaning it is not an example of a non-legal prescription. Dentists are permitted to prescribe controlled substances like opioids, which include oxycodone, vicodin, and methadone, as part of legitimate treatment for a patient under their care. This prescribing should be done cautiously to avoid overprescription and potential overdoses.