Given the high cyclic rate of fire sequences - - interspersed with pauses to change magazines - - the news that he had acquired a “bump fire” device makes sense. For that reason and given the time and effort to move so much armament into his hotel room, one supposes the shooter had to make extensive preparations for deliberately orchestrating this life ending event. 

This gives rise to a question: Has there been any sort of study to determine if during such extensive preparations, a prospective shooter typically emits any kind of behavioral pattern or signature that law enforcement specialists might be able to use, say, “big data” technology and techniques to detect and analyze? 

If such is possible, then perhaps pro-active surveillance might be undertake that would yield opportunities to nab the perp while he is making extensive preparations but BEFORE he opens fire.

Or is this asking too much of technology?