Under what condition can an REI be shortened to the one specified on the pesticide product labeling?

The correct choice highlights the importance of regulatory oversight in pesticide use management. Specifically, the "approval by the CAC," which stands for County Agricultural Commissioner, plays a crucial role in ensuring that safety protocols are being followed according to the laws and standards that govern pesticide application.

In the context of pesticide use, the Restricted Entry Interval (REI) is a critical safety measure designed to protect workers from potential pesticide exposure after application. The standard REI is set based on the potential risks associated with the specific pesticide being used. However, there are scenarios where this interval can be shortened, but only if the regulatory body, represented by the CAC, has assessed the situation and determined it to be safe to do so.

This system ensures that decisions about pesticide use, including shortening the REI, are made with appropriate oversight and adherence to safety protocols, thereby protecting workers and the environment while still allowing for agricultural flexibility.