"He Had Marijuana in his system." Nobody who knows anybody who's smoked marijuana believes that "having marijuana [in one's system]" has any conceivable relevance regarding that person's disposition towards violence. Whether one agrees or disagrees with the lack of an indictment in Ferguson, the fact that media citations of this irrelevant characteristic of the corpse of Michael Brown are tolerable in our discourse regarding someone killed--optimistically--in "a tragic accident" are a disturbing revelation of our media's blatant racism against African-Americans. Imagine if every article described Nicole Brown Simpson as having been known to mix wine with cocaine or JenBenet Ramsey as being addicted to energy drinks.... White people would have been outraged.
There's nothing subtle about it... it's just "Okay."