In the years between 1875 and 1920 Chicago had a depletion of conviction rates. This was a result of the exoneration and acquittals of criminals. This was due to Cook County government and the jurors who listened to these cases. During this period, the Progressive Era, the first juvenile system was created by Chicago officials and, to make the court system more organized and specific, specialized courts, like those for domestic disputes, were created. Not only did the court and corrections systems change, there was also a change in policing. Divisions and squads became specialized on particular types of crime. The courts began to incorporate specialists, like scientists and psychologists, to make the trial and evidence more reliable and trustworthy.