"Street" selling is the bottom of the chain and can be accomplished through purchasing from prostitutes, through cloaked retail stores or refuse houses for users in the act located in red-light districts which often also deal in paraphernalia, dealers marketing merriment at night clubs and other events, or directly from dealers who have purposefully engaged adolescents (typically). Many users sell in order to fund their own drug use. Although most are in it for the monetary outcome, some view narcotics dispensing and consumption as a means of insurrection and orchestrate it for that cacoethes. They refrain from intensive processing and abstain from umpteen 'business' practices. Although most dealers market to a changeless customer base, these mavericks may be overly advertised on hacker/phreaker/drug/etc. forums and between friends and cohorts.
U.S. Government guide to spending on illegal drugs (http://www.whitehousedrugpolicy.gov/publications/drugfact/american_users_spend/)
U.S. DOJ history of illegal drug trade (http://www.usdoj.gov/dea/deamuseum/museum_illegaldrugs.html) (rather self-serving and biased, represents DEA as triumphant over drugs)
The Cali Cartel (Spanish: Cartel de Cali) was a drugcartel based in the south part of Colombia, around the city of Cali.
During the height of Pablo Escobar's MedellĂn Cartel, the two engaged in constant conflict.
Some observers consider the cartel to have fragmented somewhat in recent years, and that it does not hold as much power as it once did, due to law enforcement efforts and the emergence of smaller cartels, though many of its newer members and drug trade routes still continue to operate.
A mule is a lower-echelon criminal recruited by a smuggling organization to cross a border carrying drugs, or sometimes an unknowing person in whose bag or vehicle the drugs are planted, for the purpose of retrieving them elsewhere.
Distribution and adulteration may traverse a selectively chosen group of cartel employees who purchase from a wholesaler and utilize a prominent population of mules or it may encompass a heavy chain of users who are selling to finance their own use.
The main organized drugcartels deal primarily with the most compact (thus easy to smuggle) and profitable substances cocaine, heroin, MDMA (ecstasy), and methamphetamine, and it is these that are the primary focus of the United States Drug Enforcement Administration.