I heard that an enormous amount of prescription drugs were stolen during the riots and the killings are territorial disputes related to who can sell what where.
I would recommend, no advise, hunting up and then viewing all 5 seasons of The Wire
The Wire fiction is now being played out for real in Baltimore City.
Rite Aid says personal information, prescriptions stolen in Baltimore looting (175,000 units)
http://www.freerepublic.com/focus/f-news/3296690/posts