Demonstrate the calculation process from the beginning to the end.

The police set up a sobriety checkpoint on the busy road leading out of the city. A large number of cars pass through the road at any given time. Not every car is stopped and questioned,; the probability of being pulled over is known to be about 10%. A bar owner at the end of the road is worried the police may target his patrons because he is not in good terms with the local police. He watches as his patrons leave the bar one by one. He asks them to send him a text message if they get pulled over. How many of his patrons out of 5 have to be pulled over for the bar owner to conclude at 95% confidence level that the police are specifically targeting his patrons?