I know very little.
I do know that if the retroreflective material is metal backed, and it is placed over the GPS antenna, it does degrade it. There was another thread on the topic.
I don't know how much reflective stuff is adequate to deter...
A recent firmware "upgrade" that was sneaked in the back door on DJI Fly drone owners whose IP addresses showed they were in the EU, forever disabled the capability of their drones to complete waypoint missions beyond the signal range of the RC...
Severe, dire trouble. No question.
The problem I have seen personally with litigation, is... once it starts, you never really know where it's going to wind up.
ESPECIALLY with the full-court press currently against drones and the government...
I don't think the FL definitions will hold water under proper scrutiny.
The concept and implementation of surveillance has been hashed out, fought against and is pretty well mature at the federal court level.
IF I were to run afoul of a FL...