Uniformed officers are driving a marked car into an area known for heavy drug trafficking, intending to investigate drug activity and anticipating encountering drug customers and lookouts.

1. One officer sees the suspect standing next to a building and holding an opaque bag.

2. The suspect looks in the direction of the officers and flees.

3. The officers turn their car, watch the suspect run through an alley, and eventually corner him on the street.

4. One officer leaves the car, stops the defendant, and conducts a frisk of the defendant, discovering a concealed handgun.