When an inspection is conducted under this paragraph, the Secretary concerned shall notify the person requesting the inspection, and such person shall be allowed to accompany the Secretary concerned or the Secretary’s authorized representative during the inspection. The Secretary shall not incur any liability for allowing such person to accompany an authorized representative. The identity of the person supplying information to the Secretary relating to a possible violation or imminent danger or harm shall remain confidential with the Secretary if so requested by that person, unless that person elects to accompany an authorized representative on the inspection. (B) The Secretaries shall, by joint rule, establish procedures for the review of (i) any decision by an authorized representative not to inspect