Drug Dealing in Privately Owned Apartment Complexes
Department of Justice, Problem Oriented Guide for Police

Link:
http://www.cops.usdoj.gov/mime/open.pdf?Item=276

Summary:
This is a guide that deals with drug dealing in privately owned apartments and other means, which are basically off the street. It is a good resource because it gives many of the indicators of this type of market, so that they might be targeted by local law enforcement. It also gives many enforcement options. This guide relates to the tactics of MS-13 because they have been known to operate or prey upon these apartment based criminal enterprises.