Looking at past records for crime , committed by relatives to see whether a criminal gene was passed to the offspring
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Adoption
Mednick study
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Mednick study
studied 14,427 children which were adopted. He compared the kids CR to their biological parent CR
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Twin Study
Christiansen Study
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Christiansen Study
studied 3586 twins in Denemark , he found that if a identical twin committed an non violent crime only 52% of the time the other twin committed a crime. 22% for non-identical twins
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