44 thieves aged 5 - 17 were seen by psychologist and given an IQ test. The psychologist made notes on the child’s behaviour and emotional state. A social worker interviewed the mother and recorded preliminary details of the child’s early psychiatric history. 50% had an IQ between 85 - 114, 15 had a higher IQ and two had a below average IQ. This study also had a control group of 44 children of the similar age, sex and IQ. They were also emotionally disturbed, but didn’t steal.