Officer Gomez observes a woman leaving a known drug house, walking down the sidewalk, casting glances at the officer in her patrol car. The woman meets up with two other women, both of whom are wearing long coats, while the outside temperature is very warm. All three women walk together away from the officer. Officer Gomez sees one of the women throw a bag away. She stops and her partner exits the patrol car, runs to the bag, and picks it up. Her partner returns to the car and tells Officer Gomez that the bag contains a white powdery substance.What justifies the officers in stopping the three women