She raises Cain because she has been humiliated. What usually makes the news is profiling of blacks. The fact is that most street-level drug dealers in Washington are black. Blacks are heavily involved in transportation of drugs for sale. Should you doubt this, ask any cop of any color.
Dealers look and behave in certain ways, and are certain kinds of people.
They are black, scruffy, young, hang in certain places, display certain body language when cops are around. So cops check them out. The downside of profiling is that, while young black males on I95, wearing scruffy clothes and driving rentals with no baggage, are in fact often drug couriers, often they aren't. Sometimes they are innocent kids of black doctors, wearing scruffy clothes because it is the current teenage way of annoying their elders. These kids get very sick, very fast, of constantly being stopped and humiliated in front of their girlfriends.