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An emergency response plan must clearly define authority roles to prevent miscommunication. The “all-clear” should only be issued by a designated person or team, such as the incident commander, safety officer, or emergency coordinator. Clarifying the chain of command (A) ensures consistency, accountability, and prevents premature re-entry into unsafe conditions. Allowing any manager (B) creates conflicting messages and chaos. Waiting for employees to self-assess (C) is unsafe and uncoordinated. Canceling drills (D) undermines preparedness and denies practice opportunities. STS supervisors must document authority roles in the plan, train staff, and practice these roles during drills. After-action reviews should confirm employees understand who is authorized to give the all-clear. Redundant communication methods (PA system, radios, text alerts) reinforce clarity. Clear authority lines strengthen worker trust and emergency effectiveness.