No, i'm clearly reading the data. You're simply speculating.
The drugs laws are widely used as pretexts for minority supression. The issue being discussed is the broader sociological function of the drugs laws: namely, to keep the elites in power, to elevate the value of their real-estate, and to provide a weak negotiating position for the under-priveledged in the labour market.
The same people that want to run away from the kids of black people are the same as those that want to throw the parents in jail (for petty drug offences and trivial parole violations).
http://www.businessinsider.com/kent-brewster-analyzes-athert...
http://paloaltofreepress.com/living-in-palo-alto-while-black...
http://www.insidebayarea.com/dailyreview/localnews/ci_110345...
Today, African-Americans are also more likely to spend time in prison for drug related offenses than their white counterparts. According to the Sentencing Project, African-Americans make up 12% of the nation’s drug users, but represent 34% of those arrested for drug offenses, and 45% of those in state prison for such offense as of 2005.
Of course, there's plenty of white collar drug abuse running rampant in high-rent neigborhoods. To wit:
http://dealbreaker.com/2014/10/jefferies-exec-sage-kelly-emp...
Clearly there is a demand for low-level discretionary powers that can serve the social-sorting priorities of those with wealth and power. The drug laws fill those roles today, and whether we like it or not, there seems to be "a demand" that they serve for some people well beyond their "literal" or statuatory meaning.