IF the R/C falls under FAA regulations it does. I believe there is a size limit there. However, any device used to violate privacy has already been deemed an invasion by the operator and any use of force necessary to protect the privacy is fair game.
True. Same applies to model rocketry. Size/altitude limits. I joined a club for a bit, and they did flights where they had to have FAA approval for launch (I know there were flights upwards of 5,000 AGL, and we were already at 5,000' - 6,000' or so above sea level in the Albuquirky metro-area).