https://www.law.cornell.edu/supremecourt/text/328/256
First 500 ft/ 152.4 m of airspace above that point (highest structure)is a̶ ̶f̶r̶e̶e̶ ̶f̶i̶r̶e̶ ̶z̶o̶n̶e̶ ̶ encroachment ... in that zone a drone is in trespass
Discharging a firearm (or a rocket launcher) within a jurisdiction may be unlawful **
FCC (US) regulation is 1000 ft above any structure.