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Assessing Police Officers' Decision Making and Discretion in Making Traffic Stops in Savannah, Georgia, 2002 (ICPSR 4340)

Released/updated on: 2006-01-16

Geographic coverage: Savannah, United States, Georgia

Time period: 2002-04-01--2002-11-30

This study aimed to fill a void in the research regarding police behavior by focusing on the formation and creation of cognitive suspicion by officers. The study also examined formal actions (stops) taken by the police pursuant to that suspicion. The study was conducted using observational research methods and collected quantitative and qualitative data on officer suspicion. Data were collected by observers who rode along with patrol officers from April 2002 to November 2002. Field observers used three major data collection instruments in order to gather as much relevant information as possible from a variety of sources and in diverse situations. The Officer Form was an overall evaluation of the officer's decision-making characteristics, Suspicion Forms captured information each time an incident occurred, and a Suspect Form was a compilation of data from the citizen who had the encounter with the officer. Additional documents included informed consent forms, a card detailing the language to be used for the initial contact with citizens, and hourly activity forms. Anytime a suspicion was formed or a formal action was taken after a suspicion was formed, the observer debriefed the officer as to his or her thoughts and elicited the officer's overall rating of the encounter. Data in this collection include general demographic characteristics of the officer and the suspect, as well as the area in which the suspicion was formed. Data was also gathered regarding what led the officer to form a suspicion, and why a person was or was not stopped.

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Bruising as a Forensic Marker of Physical Elder Abuse in Orange County, California, 2006-2008 (ICPSR 28144)

Released/updated on: 2012-12-21

Geographic coverage: United States, California

Time period: 2006-07-01--2008-05-31

The purpose of the study was to describe bruising as a marker of physical elder abuse. Consenting older adults were examined to document location and size of bruises and assess whether they were inflicted during physical abuse. An expert panel confirmed physical abuse. A research nurse conducted study assessments on 67 adults aged 65 and older reported to Adult Protective Services for suspected physical elder abuse in Orange County, California between July 2006 and May 2008. The study contains a total of 142 variables including age, sex, ethnicity, functional status, medical conditions, cognitive status, history of falls, bruise size, bruise location and color, recall of cause, and responses to the Revised Conflicts Tactics Scales (CTS2) and to the Elder Abuse Inventory (EAI).

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Eyewitness Identification: A Systematic Investigation of Lineup Composition and Fairness, United States, 2019-2022 (ICPSR 38761)

Released/updated on: 2025-06-26

Geographic coverage: United States

Time period: 2019-01-01--2022-12-31

The major objective of this project was to investigate photo array composition in order to improve eyewitness identification procedures. Photo array composition involves the fillers, or known-innocent individuals that police add to a photo array so that the perpetrator/suspect (referred to as the "target" in experimental design) does not stand out. An unbiased (fair) photo array contains fillers that match the description of the suspect provided by one or more eyewitnesses. In contrast, in a biased photo array, the suspect stands out from the fillers. Another popular procedure used by police is the showup, when the suspect is presented without any fillers. This project involved all three of these procedures.

This collection contains raw and aggregated data from 12 sets of experiments that investigated different aspects of eyewitness identification, including fair vs. biased lineups, lineup size, distinctive facial features, target-filler similarity, impact of sleep on eyewitness accuracy, memory strength, number of suspects presented, impact of courtroom instructions and expert expertise, and speed and confidence of eyewitness identification. Each experiment set followed a similar general design, with variations based on the purpose and hypotheses of the specific study. United States-based adult participants recruited via SurveyMonkey were asked to complete an online experiment in which they would be presented with a crime vignette and a suspect facial image (created from a faces database), given a distractor task, and then asked to select the suspect from a lineup and rate the confidence level of their decision.

The data were provided to ICPSR in Excel workbook format (41 data files, 3 codebooks) and are available for download as a zipped package. ICPSR has not modified the files from the format in which they were supplied. Data files are organized into subfolders that are named with a short content descriptor and citation of the relevant publication. Unless noted, data files contain a "codes" sheet that explains the variables and experimental condition groups. Articles and theses/dissertations that used each dataset are available under Data-related Publications. Please refer to the ICPSR README for more information.

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Neuropsychological and Emotional Deficits as Predictors of Correctional Treatment Response in Maryland, 2003-2005 (ICPSR 20349)

Released/updated on: 2008-03-31

Geographic coverage: United States, Maryland

Time period: 2003-03-01--2005-12-31

The study was designed to elucidate underlying neuropsychological and emotional regulatory mechanisms in variable responses to a cognitive-behavioral therapy (CBT) program among prison inmates. This study tested the hypotheses that performance deficits in executive cognitive function (ECF) tasks and emotional responses will characterize aggressive and disruptive inmates and predict treatment response. All subjects were examined using noninvasive behavioral, psychological, ECF, and hormone tests. The data contain a total of 232 cases. Inmates volunteering to participate in the cognitive-behavioral therapy (CBT) program offered by the Maryland correctional system were recruited from three facilities using a pseudo-random selection procedure during intake into the program. Consenting inmates received an extensive baseline testing battery of several complementary dimensions of higher order neuropsychological functions as well as conditions that influence them: (1) three ECF tasks and one emotional perception task, (2) collection of salivary cortisol during an acute stress task and the Symptom Checklist 90 (SCL-90) taken beforehand, (3) a short general neuropsychological test, (4) three psychological questionnaires, (5) an historical inventory to assess prior drug use and child and family background, and (6) a treatment readiness, responsivity, and gain scale. An events inventory and a success inventory were also administered. Several additional tests were administered repeatedly throughout treatment. A record review was conducted after program completion to ascertain incidents of institutional misconduct as well as treatment performance outcomes. Variables include IQ, demographics, background information, prior drug use, early trauma, psychopathy, aggression, stressful events, success, reactions to provocation, treatment readiness, emotional perception/regulation, executive cognitive performance, cortisol measures, treatment gain, treatment responsivity, treatment completion, Maryland Offender Based State Correctional Information System (OBSCIS) data, institutional infractions, segregations, and several other computed variables.

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Use and Effectiveness of Hypnosis and the Cognitive Interview for Enhancing Eyewitness Recall: Philadelphia, 1988-1989 (ICPSR 9478)

Released/updated on: 2006-03-30

Geographic coverage: United States, Philadelphia, Pennsylvania

Time period: 1988-01-01--1989-06-30

This study investigated the effectiveness of hypnosis and the cognitive interview (a technique for stimulating memory) on the recall of events in a criminal incident. The data collected in the study address the following questions: (1) Does hypnosis or the cognitive interview mitigate recall deficits that result from emotionally upsetting events? (2) Does hypnosis or the cognitive interview improve recall when individuals recall events in narrative fashion? (3) Does hypnosis or the cognitive interview improve recall when individuals are required to respond to each item in a set of focused questions? (4) Does the cognitive interview improve recall better than motivated control recall procedures? For this two-stage study, subjects were randomly assigned to receive hypnosis, cognitive interview, or control treatment. Stage 1 involved completing unrelated questionnaires and viewing a short film containing an emotionally upsetting criminal event. Stage 2 was conducted 3 to 13 days later (the average was 6.5 days) and involved baseline information gathering about the events in the film, application of the assigned treatment, and post-treatment written recall of the events. Data were collected from the written narratives provided by subjects and from an oral forced recall of events in a post-experimental interview. Variables in File 1 include total information (correct, incorrect, confabulations, and attributions) as well as new information given in the post-treatment written narrative. The remaining variables in File 1 include score on Harvard Group Scale of Hypnotic Susceptibility, Form A (HGSHS:A), repressor status, and the number of days between viewing the film and completing the baseline and post-treatment interviews. Variables in File 2 were derived from the post-experimental oral forced recall interview and include total correct and incorrect responses and confidence ratings for correct and incorrect responses. The unit of observation is the individual.