Identifying Chicago's High Users of Police-Involved Emergency Services.

Objectives: To identify individuals at risk for behavioral health (BH)-involved encounters with police in Chicago, Illinois.

Methods: We linked Chicago Police Department (CPD) arrest and Fire Department (CFD) BH-involved ambulance event data. We identified at-risk individuals who accumulated at least 1 BH-involved ambulance and at least 1 arrest event between May 2016 and April 2017.