There are many studies in this area and some overlap. Some researchers have already conducted comparisons of studies to determine if there are common variables that predict juvenile delinquency. A comparison of Sociological and Psychological and Psychiatric studies in these areas would be interesting and informative. The idea would be to find where studies agree and where they disagree and then come up with some ideas about what to do next. This is a controversial area especially between disciplines.
Some people lecture on the evils of IQ testing, some conduct studies.
What are the issues and is it worthwhile to use IQ in the diagnosis and treatment of delinquents. A related question is how knowing and IQ score is useful when working with delinquents. This is and older but controversial area in Criminology. What are the issues here. There are many studies on genetics and crime.