Of course, this is a common practice, to sell things in black/hispanic neighborhoods that aren't sold in white neighborhoods. Like those high alcohol content drinks such as St. Ides...no way will that be found in the middle-class town where I live!
And those stories you hear about little kids being able to buy cocaine from ice cream trucks...true, I'm afraid, but again, not in my town!
I remember living in this town with only about 137,000 people in it, but there was the "hispanic side" known as "felony flats" or "chivatown" and that's the part of town you go to if you want used guns, prostitutes, heroin and cocaine, pawn shops and those money-lending places, bars and cigarette vendors that don't card, stores where you can sell your used Levi's, etc. And also in that part of town there is a hair salon that specializes in cutting black people's hair. Black people go to the university; why isn't the salon there? People sell drugs on campus and the police ran them all out, and now people don't sell and use drugs there openly anymore. The police also arrested all the homeless people who sleep in business doorways near campus. But in felony flats, none of that is going on. When I was a police cadet we would patrol the area and use binoculars and would see drug deals all the time but it was always my supervisor's call as to whether to do anything and every time he said no. There are homeless people sleeping in doorways in this part of town, and the police don't do anything. Maybe give them a ticket, but not set out regular patrols like they did in the richer areas to make sure it didn't happen again. The same homeless people would often be ticketed a few times in one day.
Clearly, there is more emphasis placed on improving middle-class communities than poorer ones. I think the police are just glad that the drug dealers and homeless people stay out of the rich areas now. As long as they're "contained" in their place, no concern.