Prior to passage of the sanctuary ordinance, ICE agents regularly worked with county prosecutors using the Law Enforcement Agencies Data System, or LEADS. Agents would thumb through sheets of new defendants' backgrounds, looking for those who could be foreign-born nationals. Those suspected of not having the proper paperwork to live legally in the United States would then be interviewed by ICE agents at the jail's intake area, and a "detainer" would be placed on people ICE wanted held if they were able to post bond.