I remember a case of someone being SWATted twice in a year.
There are certain video game and entertainment executives in southern California who get swatted every week.
The local police departments keep special notes (public safety notices) about these addresses and have protocols in place to verify the situation before sending in SWAT teams.
But they don't catch the swatters. Most of them are out of state or even out of the country. This is one of the few arenas where the Federales have better capabilities than the locals. Too bad they have other priorities.