The Crisis intervention team model (CIT) is possibly the most well known and widely adopted model to improve police response to persons with mental illness. A primary goal of CIT programs is to divert individuals with mental illness from the criminal justice system to mental health services. In this paper we examine the effectiveness of fielding CIT trained and supported officers for influencing call outcomes using data from patrol officers (n = 112) in four Chicago Police districts. Results from regression analysis indicate that CIT certified officers directed a greater proportion of persons with mental illness to mental health services than their Non-CIT certified peers. CIT did not have an immediate effect on arrest. Moderator analysis indicates that CIT had its biggest effect on increasing direction to services and decreasing "contact only" among officers who have a positive view of mental health services and who know a person with mental illness in their personal life. Additional moderators of the CIT effect on call outcomes include level of resistance and the presence of a weapon. Findings from this study have important implications for policy, practice and future research.

Over the last half century in the United States, we have seen the criminal system become increasingly aggressive in its response to violence against intimate partners. Although policies have been implemented to encourage arrest, police continue to maintain discretion over whether or whom to arrest in cases of intimate partner violence (IPV). Using data from three national data sets, we examined the contributions of incident, agency, and community factors on the police arrest decisions, independently considering atypical cases of women arrested and dual arrest. The findings from this study reveal that incident factors account for the majority of the variance in arrest for single arrest cases, more so than factors associated with the particular police agency or the community in which the alleged crime occurred. The frequency of dual arrest is affected more by community factors. The findings from this study can be used to guide police training and local policies as well as to inform legislation designed to prevent variance in arrest based on sociodemographic and other extralegal factors.

The large numbers of people with mental illness in jails and prisons has fueled policy concern in all domains of the justice system. This includes police practice, where initial decisions to involve persons in the justice system or divert them to mental health services are made. One approach to focus police response in these situations is the implementation of Crisis Intervention Teams (CIT). The CIT model is being implemented widely, with over 400 programs currently operating. While the limited evidence on CIT effectiveness is promising, research on CIT is limited in scope and conceptualization-much of it focusing on officer characteristics and training. In this paper we review the literature on CIT and present a conceptual model of police response to persons with mental illness that accounts for officer, organizational, mental health system and community level factors likely to influence implementation and effectiveness of CIT and other approaches. By moving our conceptualizations and research in this area to new levels of specificity, we may contribute more to effectiveness research on these interventions.