Conduct Disorder

Aggression
Aggressive behavior is reactionary and impulsive behavior that often results in breaking household rules or the law; aggressive behavior is violent and unpredictable.  More »
Gale Encyclopedia of Children's Health

Drug Abuse
Drug abuse is the use of illegal drugs, or the misuse of prescription or over-the-counter drugs. See also: Drug abuse and dependence; Drug abuse first aid.  More »
ADAM

Bullying
An aggressive child who repeatedly victimizes a less powerful child with physical and/or emotional abuse. Bullying usually involves an older or larger child (or several children) victimizing a single child who is incapable of defending himself or ...  More »
Gale Encyclopedia of Childhood and Adolescence