Really? I kinda doubt that if an African-American leaves a transaction forgetting to enter the PIN, they're going to "detain" the African-American ---in prison---. The police are probably going to do the same thing they would do with you, a self-describe "white" American: Make you go back and finish the transaction. And if a "white" or African-American were to just walk out with the merchandise never bothering even to pretend to pay, then they would both be detained in prison in a normal U.S. state. (Not in the West Coast, though, where everyone of every race can shoplift under $1,000 with impunity.)