There are many sociological factors that contribute to the criminalization ranging from family background, social class and financial status, and associations. For instance, "experts estimate that 70%–90% of all community violence committed by adolescents and young adults is attributable to gang membership"(Thornberry, Huizinga, & Loeber, 2004). So one can assume from this, if an individual is a member of a gang, he or she is highly likely to be involved in violent acts. Add to that that most gang activity is targeted toward generating revenue from drug trade(Korgen & Furst, 2012), you can also imply they are into drugs. All of this only because of your associations.