C.S.I via SWAT

I learn something new every day.  When a SWAT team enters a home, they pull out every drawer and empty all cabinets of everything.  They leave dresser drawers on the floor, emptied of all their contents.  They remove drawers from the kitchen cabinets and empty the contents of the cabinets.  They take apart the furniture, and leave gaping holes in the couches and chairs.  They evidently are not in the habit of putting anything back either.  They don't even try to remove the scorch marks left on the floor from the flash bomb launched through the window.  You would wonder what they're looking for.