DOI: 10.3886/icpsr37048
title: The Benefits of Body-Worn Cameras: New Findings from a Randomized Controlled Trial at the Las Vegas Metropolitan Police Department, Nevada, 2014-2015
title: Archival Version

description: These data are part of NACJD's Fast Track Release and are distributed as they were received from the data depositor. The files have been zipped by NACJD for release but not checked or processed except for the removal of direct identifiers. Users should refer to the accompanying readme file for a brief description of the files available with this collection and consult the investigator(s) if further information is needed.
This study reports the findings of a randomized controlled trial (RCT) involving more than 400 police officers and the use of body-worn cameras (BWC) in the Las Vegas Metropolitan Police Department (LVMPD). Officers were surveyed before and after the trial, and a random sample was interviewed to assess their level of comfort with technology, perceptions of self, civilians, other officers, and the use of BWCs. Information was gathered during ride-alongs with BWC officers and from a review of BWC videos. 
The collection includes 2 SPSS data files, 4 Excel data files, and 2 files containing aggregated treatment groups and rank-and-treatment groups, in Stata, Excel, and CSV format:

SPSS: officer-survey---pretest.sav (n=422; 30 variables); 
SPSS: officer-survey---posttest2.sav (n=95; 33 variables); 
Excel: officer-interviews---form-a.xlsx (n=23; 52 variables); 
Excel: officer-interviews---form-b.xlsx (n=27; 52 variables); 
Excel: ride-along-observations.xlsx (n=72; 20 variables); 
Excel: video-review-data.xlsx (n=53; 21 variables); 
Stata: hours-and-compensation-rollup-to-treatment-group.dta (n=4; 42 variables) ; 
Excel: hours-and-compensation-rollup-to-treatment-group.xls (n=4; 42 variables) ; 
CSV: hours-and-compensation-rollup-to-treatment-group.csv (n=4; 42 variables) ; 
Stata: hours-and-compensation-rollup-to-rank-and-treatment-group.dta (n=12; 43 variables); 
Excel: hours-and-compensation-rollup-to-rank-and-treatment-group.xls (n=12; 43 variables); 
CSV: hours-and-compensation-rollup-to-rank-and-treatment-group.csv (n=12; 43 variables);
description: This study was undertaken to determine the impact of the body-worn cameras (BWC) on a variety of outcomes, including officer use of force, complaints of officer misconduct, and officer discretionary activities.  The study also provided a cost-benefit analysis associated with the use of BWCs.
description: Approximately 400 officers in the Las Vegas Metropolitan Police Department (LVMPD) took part in the randomized controlled trial (RCT) of the body-worn cameras (BWC), with approximately 200 assigned to treatment and 200 to control groups for a year.
Comparisons on the dependent variables of interest (including use of force incidents, civilian complaints of police misconduct, and measures of proactive police activities such as arrests and citations) between the BWC treatment officers and the control officers were then conducted.  The officers were surveyed before and after the trial.
Throughout the research project, a random sample of officers from the treatment group were interviewed to assess level of comfort with technology, perceptions of civilians, self, and of how other officers related to BWCs among other topics.
Information was gathered during ride-alongs with BWC officers, and was also gathered from review of BWC videos.
The study also included a cost-benefit analysis of BWC implementation.
description: officer-survey---pretest.sav (n=422; 30 variables), and officer-survey---posttest2.sav (n=95; 33 variables)

officer demographics; 
level of experience/comfort with technology; 
police legitimacy and procedural justice; 
discretion and police ethics; 

officer-interviews---form-a.xlsx (n=23; 52 variables), and officer-interviews---form-b.xlsx (n=27; 52 variables)

comfort with BWC technology; 
officer perceptions of citizens; 
officer perceptions of self; 
officer perceptions of other officers; 
positives and  negatives; 

ride-along-observations.xlx (n=72; 20 variables)

event types; 
BWC activation/deactivation; 
citizen reaction/other officer reaction; 
officer behavior; 

video-review-data.xlsx (n=53; 21 variables)

event type and attributes; 
subject demeanor; 
BWC recording quality; 

hours-and-compensation-rollup-to-treatment-group: all variables aggregated by treatment in Stata, Excel, and CSV formats (n=4; 42 variables)

treatment vs. control group counts; 
pre- and post-implementation observation periods; 
officer hours: regular, vacation, sick, overtime, in court, suspended, etc.; 
officer compensation: pay, cost of benefits such as medical and retirement; 

hours-and-compensation-rollup-to-rank-and-treatment-group: all variables aggregated by rank and by treatment
in Stata, Excel, and CSV formats (n=12; 43 variables)

treatment vs. control group counts; 
pre- and post-implementation observation periods; 
officer hours: regular, vacation, sick, overtime, in court, suspended, etc.; 
officer compensation: pay, cost of benefits such as medical and retirement;
description: Presence of Common Scales: 
					Several Likert-type scales were used.
description: Response Rates: 
					officer-survey---pretest.sav: 100 percent 
officer-survey---posttest2.sav: 23 percent (95 responses with 58 from treatment group, 37 from control group).
description: Datasets: 
					
						DS1: Dataset
description: coded on-site observation
description: coded video observation
description: face-to-face interview
description: on-site questionnaire
description: web-based survey
description: Patrol Officers from the Las Vegas (Nevada) Metropolitan Police Department.
				   		Smallest Geographic Unit: Police Dpartment Command Area
description: Duty rosters from the Las Vegas Metropolitan Police Department (LVMPD) commands provided the sampling frame of approximately 1,100 officers in the patrol division, from which a target sample of 400 was drawn. These 400 were then randomly assigned into treatment and control groups. After the 200 officers in the treatment group received the appropriate training and were issued body-worn cameras (BWCs), officers in both groups then were monitored for one year.