What is a key requirement for a court to engage in reviewing certain cases?

The key requirement for a court to engage in reviewing certain cases is the final action by the agency involved. In administrative law, a court typically only has jurisdiction to review the actions of an agency once a final decision has been made. This finality ensures that all internal processes and procedures have been exhausted before judicial intervention can occur.

When an agency makes a final decision, it means that the issue has been fully resolved within the agency’s context, allowing the court to evaluate the legality and appropriateness of that decision without encroaching on the agency's expertise or ongoing processes. This requirement upholds the principles of administrative efficiency and separation of powers, as it prevents premature challenges that could disrupt agency operations.

In contrast, the other options do not represent foundational requirements for court review. The presence of expert witnesses may be relevant to the merits of a case but is not a prerequisite for judicial review. Public objection to decisions can influence agency actions but does not entail a necessary step for a court to review a case. Lastly, support from legislative bodies may help inform an agency’s policies, yet it is not a direct requirement for judicial review either. Thus, the emphasis on final action by the agency is crucial in establishing the proper framework for judicial review.