Conduct Disorder (CD) is diagnosed when children show an on-going pattern of aggression toward others, and serious violations of rules and social norms at home, in school, and with peers. These rule violations may involve breaking the law and result in arrest. Children with CD are more likely to get injured and may have difficulties getting along with peers.

Examples of CD behaviours include:

• Breaking serious rules, such as running away, staying out at night when told not to, or skipping school
• Being aggressive in a way that causes harm, such as  bullying, fighting, or being cruel to animals
• Lying, stealing, or damaging other people’s property on purpose