Having said that, it is not inappropriate to note that yet another unanticipated consequence of the war on drugs has been uneven enforcement among the races. While that is not a reason to fail to enforce the law, it may be a reason to repeal the law. One wrong does not justify another, but invidious enforcement between races might not be a desirable social outcome.
Back in the 60s the black community in Philadelphia was complaining because the police were arresting row house occupants for drinking on their front stoops while letting white suburbanites drink freely in their backyard grill parties. There was a time when both might be hassled by the police for breaking prohibition.
No matter how you spread it, bull shit is still bullshit. Don’t do drugs, don’t deal drugs.