The police respond to a call and find an empty motel room that looks clean in normal light. A detective sprays a colorless liquid on the walls and floor, closes the blinds, and turns off the lights. In the dark she sees spots on the floor that give off a blue glow. The detective tells a uniformed officer to cordon off the room as a possible crime scene. What causes the blue glow? Why does the detective suspect that a crime took place in the room?
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