Happiness can deter crime US study finds

Research at UC Davis - based on a data on 15,000 adolescents in the USA has found that:

Happier adolescents were less likely to report involvement in crime or drug use. Adolescents with minor, or nonclinical, depression had significantly higher odds of engaging in such activities

Adolescents who experienced a decrease in their level of happiness or an increase in the degree of their depression over a one-year period had higher odds of being involved in crime and of using drugs.

The odds of drug use were notably lower for youth who reported that they were more often happy than depressed, and were substantially higher for those who indicated that they were more depressed than happy.

http://www.eurekalert.org/pub_releases/2011-08/uoc--hcd081511.php