14 CFR 107.125: Category 3 operations: Operating requirements.

To conduct Category 3 operations, a remote pilot in command—

(a) Must use a small unmanned aircraft that—

(1) Is eligible for Category 3 operations pursuant to § 107.130(a);

(2) Is listed on an FAA-accepted declaration of compliance as eligible for Category 3 operations in accordance with § 107.160; and

(3) Is labeled as eligible for Category 3 operations in accordance with § 107.130(b)(1);

(b) Must not operate the small unmanned aircraft over open-air assemblies of human beings; and

(c) May only operate the small unmanned aircraft above any human being if operation meets one of the following conditions:

(1) The operation is within or over a closed- or restricted-access site and all human beings located within the closed- or restricted-access site must be on notice that a small unmanned aircraft may fly over them; or

(2) The small unmanned aircraft does not maintain sustained flight over any human being unless that human being is—

(i) Directly participating in the operation of the small unmanned aircraft; or

(ii) Located under a covered structure or inside a stationary vehicle that can provide reasonable protection from a falling small unmanned aircraft.