ALSPAC can collect information on participants life events through linking to their routine administrative records held by UK government. These are the records that all of us build up as we use government services (such as school records or GP records) or interact with government in other ways. For some participants, this will include records of criminal convictions and cautions. As part of ALSPACs work to establish these linkages we have conducted a pilot exercise linking some participants to their Police National Computer (PNC) database records (see project B557 for this work). The result of this linkage was a completely anonymous dataset, i.e. it includes ALSPAC participants PNC records, but cannot be linked to the ALSPAC dataset. In this project we would like to conduct simple comparisons of criminal records in this pilot exercise with participant reported criminality information provided at focus clinic and in questionnaires. The evidence will help inform the development of our linkage strategy.