Which principle addresses the prohibition of engaging practice that violates the Code of Ethics by anyone under supervision?

The correct choice focuses on the principle that emphasizes the responsibilities of individuals under supervision in relation to ethical practices. Specifically, the Principle of Ethics IV is concerned with the responsibilities of supervision, ensuring that those who are supervised operate within a framework that maintains ethical standards.

Rule I under this principle explicitly outlines that individuals who are supervising must ensure that those they supervise, including speech-language pathology assistants, adhere to the established Code of Ethics. This is particularly important because any violation of these ethical standards by someone under supervision could potentially undermine the integrity of the entire profession and harm clients.

This principle highlights the importance of accountability in the professional practice of speech-language pathology, ensuring that all practitioners maintain ethical conduct, regardless of their level of experience or status. By emphasizing the supervisory responsibility, it safeguards against unethical practices that might occur in educational or clinical settings.