I've had a friend and an in-law who asked me to haul something while owning pick-ups. They said they didn't want their trucks scratched or dirty, so why buy a truck?
Mexico responses by naming U.S.A. Northern Mexico.
Enough to be visible, fine enough to fall slowly. Would the dome become visible? Would it spark an electrical or magnetic event? Having sensors inside and outside to see if the signal manifested?
If they used fiber-optic cables on all the aerial drones, balloons then they would either keep control and data or see precisely when the disruptions happened and could record any electric or magnetic cause.
Roll poison ivy before playing.