How can the Department not recover costs incurred due to a failure to rule in 30 days?

The correct choice highlights that if the Department fails to issue a ruling within 30 days, it cannot retroactively pursue recovery of costs incurred during that period. This is significant because it establishes a strict timeline for the Department's obligations. Once that 30-day window closes without a decision, the opportunity to recoup those expenses is forfeited, emphasizing the importance of timely administrative action.

This principle ensures that members of the Department are not left in a prolonged state of uncertainty regarding their expenses and clarifies the accountability of the Department in managing cases efficiently. Timely rulings are important to protect both the members and the integrity of the Department's operations, illustrating the necessity for adherence to established timelines in administrative processes.