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FTA:

"Whenever the band found brown M&M's candies backstage, they immediately did a complete line check, inspecting every aspect of the sound, lighting and stage setup to make sure it was perfect. David Lee Roth would also trash the band’s dressing room to prove a point -- reinforcing his reputation in the process."

So, in summary: the team of roadies DIDN'T always do a a complete line check. And DLR would just make life hard for the hotel staff. That's just dumb all around.