Under what conditions may a non-faculty coach accompany students on a school trip?

A non-faculty coach may accompany students on a school trip if they are at least 21 years old and have passed a background check. This requirement emphasizes the importance of ensuring the safety and well-being of students during school-sponsored activities. The age limit helps to ensure a level of maturity and responsibility, while the background check is crucial for identifying any potential risks, ensuring that individuals who are working with students have been vetted for safety.

The other options do not have the same level of relevance or assurance. Having coaching certifications or prior coaching experience does not adequately address the safety and security concerns necessary for supervising students on trips. Similarly, being a parent of a participating student may not ensure the individual has met the necessary background checks or the maturity required for this level of responsibility.