To ensure full disclosure of the date beyond which milk or milk products may no longer be offered for sale, all dairy processors shall establish, and legibly label as prescribed by rule of the department, the maximum shelf-life period during which milk and milk products may be offered for sale. For purposes of this requirement, to “legibly label” means to label the package or container with conspicuous and easily readable boldfaced print or type in distinct contrast to the background, by color. The department shall periodically conduct shelf-life studies to review the quality of milk and milk products and shall sample periodically the products of the dairy processors to determine if the shelf-life dating used by the processors complies with the minimum standards of quality. Milk imported from outside the Virgin Islands shall have a maximum shelf-life period no longer than permitted by the regulatory agency where processed. The department may require certification from the regulatory agency specifying the maximum shelf-life period allowed.