 Shortly after, he was employed by the Ministry of Justice.Guerry worked with the data on crime statistics in France collected as part of the "General office for administration of criminal justice" in France, the first centralized national system of crime reporting.Guerry was so fascinated with these data, and the possibility to discover empirical regularities and laws that might govern them, that he gave up the active practice of law to devote the rest of his life to study crime and its relation to other moral variables.