Policing the American University: Online Appendix

For additional context, online Appendix B is an online appendix giving additional tables and graphs providing more detailed disaggregation of CPD data presented in Policing the American University.

UCR Coverage by Sector and Size

We can further breakdown these results by distinguishing universities by both size and whether they are public or private in the table below. Here we confirm the previous findings by BJS that public universities are more likely to have police agencies and that almost all campus police serve larger public or private non-profit institutions.

University Type	Number of Students	Campus Count	Matched ORI	One or More Employees	One or More Arrests
Public	20,000 and above	191	142	138	123
Public	10,000–19,999	277	157	143	116
Public	5,000–9,999	392	196	167	140
Public	1,000–4,999	687	177	142	102
Public	Under 1,000	448	40	17	10
Private not-for-profit	20,000 and above	23	7	8	6
Private not-for-profit	10,000–19,999	52	14	15	14
Private not-for-profit	5,000–9,999	111	23	16	15
Private not-for-profit	1,000–4,999	723	81	58	37
Private not-for-profit	Under 1,000	1,012	23	7
Private for-profit	20,000 and above	10
Private for-profit	10,000–19,999	8
Private for-profit	5,000–9,999	13
Private for-profit	1,000–4,999	135	2	1
Private for-profit	Under 1,000	2,860	4	2

Further Analysis of Trends in Arrests per Officer

CPD Trends in Arrests per Officer by Offense

Another way to look at campus police arrest rates over time is to standardize the arrests by the number of officers being reported on. This figure shows the same patterns of growth and the same relative rankings of offenses in the overall arrest trend and the arrests per student trend. This suggests that as more campus police departments report their data to the UCR the same overall pattern of arrest volume is holding.

Variance in CPD Arrests per Officer over Time

This figure shows the distribution of the arrests per officer across all CPDs with at least 5 arrests and 5 officers. This figure shows that while the mean arrests per officer for all CPDs has changed over time, the distribution of arrests per officer across CPDs has remained relatively stable. The biggest change has been a dramatic reduction in the most extreme outliers of arrests per officer, highlighted by the shrinking of the 75th percentile value (far right red line). The distribution has also become less bi-modal over time.

Further Comparisons of Campus and Municipal Police

Comparing Total Arrests by Offense for Campus and Municipal Police Departments in 2016

Comparing Arrest Share of Offenses in 2016 between Campus and Municipal Police Departments

Comparing Arrest Share of Offenses by Race (Black and White) for CPDs in 1996 and 2016

Individual Campus Arrest Trends for Marijuana

Marijuana Possession Arrest Trends for 35 Largest CPDs

Marijuana Possession Arrest Trends for 25 CPDs with Most Marijuana Possession Arrests

Individual Campus Arrest Trends for Arrests of Black People

Arrest Trends of Black People for 25 CPDs with Most Arrests of Black People since 1980

Trends in CPD Arrests for Rape and Sex Offenses

Number of CPDs Making Arrests and Total Arrests by CPDs for Rape and Sex Offenses