14 CFR § 101.7 - Hazardous operations.
§ 101.7 Hazardous operations.
(b) No person operating any moored balloon, kite, amateur rocket, or unmanned free balloon may allow an object to be dropped therefrom, if such action creates a hazard to other persons or their property.
(Sec. 6(c), Department of Transportation Act (49 U.S.C. 1655(c)))