Officers have visual scan strategies and rely on neck and head actions when scanning for threats that provide a wider field of view than a body-worn camera (BWC). The study in the source article determined how an officer’s visual scanning of a simulated use of force encounter differed from digital information captured by BWCs. Officers detected behavioural cues of actual and potential threats in the encounter that the BWCs missed. In fact, eye-tracking glasses worn by officers captured every pre-determined critical event examined by the researchers more frequently than their BWCs. During post-event investigations of use of force incidents, the interpretation of footage from BWCs may lead to faulty conclusions by missing critical events that drive officer actions but are not captured by their BWC.

We compared shoot/don't shoot task (SDST) performance in law enforcement officers (LEOs) and non-officers under normal cognitive load, and under higher load induced by processing a complex dispatch message. We also examined the effects of participants' behavioural activation (BAS) and inhibition (BIS) systems, impulsivity, and working memory on SDST performance. Stimuli were videos of shoot and don't shoot variations performed by three actors. Dependent measures were shoot errors, fail-to-shoot errors, response time, and shooting accuracy. Compared to non-officers, LEOs were more accurate and adapted to make fewer fail-to-shoot errors. They were not faster, and did not make fewer shoot errors. Compared to normal cognitive load, under higher load, participants were quicker and more accurate, but made more shoot errors. The higher cognitive load condition revealed effects that were not present under normal load. Participants making more shoot errors had higher BAS, and BIS than those making fewer or no errors.

We aimed to infer the effectiveness of officers' training and experience by assessing consistency of behavioural responses between them. If officers facing the same scenario respond in similar ways, this implies their use of shared cognition, through acquired in-common tactical knowledge. Officers (n = 42) responded to a live-acted scenario in which an assailant ultimately discharged his weapon. Triangulated camera positions assessed their movement patterns, final positions, and weapon responses relative to when the assailant fired his weapon. We also assessed the officers' visual search and gathered information regarding their experience and rest. Our second aim was to examine sources of variability in the officers' responses. We found extensive variability in all aspects of the response. Experience did not impact spatial or temporal behavioural responses. However, longer hours awake and lower reported rest negatively impacted officers' responses. We conclude that officers had insufficient training and experience to demonstrate in-common knowledge.Practitioner summary: Police officers showed high spatial and temporal variability in response to the same scenario. This implies inadequate tactical training, and is supported by our finding that training and experience did not impact performance. Instead, the officers' variability was constrained by their visual search, and the hours awake before being tested.

Although officer body-worn cameras (BWCs) have improved transparency of police interactions within the community, BWCs have a limited field of view, are subject to bias, and do not account for the factors that influence rapid decision-making by officers, including their visual attentional control and perceptual processes. The purpose of this study was to investigate the camera perspective of six critical incidents and position data from BWC compared to eye tracking and head movement data in a use-of-force scenario from 44 active-duty police officers. The analysis of gyroscope and accelerometer data demonstrated low correlations between eye cameras and BWC position data. Officers attended 80.5% of all critical incidents, whereas BWC view captured only 66.2%, especially missing key events (<48%). BCW footage did not account for the visual information and the behaviors of the suspect, potential threats, and bystanders who influence the officers' decision-making during the use of force encounters.

Police officers during dynamic and stressful encounters are required to make rapid decisions that rely on effective decision-making, experience, and intuition. Tactical decision-making is influenced by the officer's capability to recognize critical visual information and estimation of threat. The purpose of the current study is to investigate how visual search patterns using cluster analysis and factors that differentiate expertise (e.g., years of service, tactical training, related experiences) influence tactical decision-making in active-duty police officers (44 active-duty police officers) during high stress, high threat, realistic use of force scenario following a car accident and to examine the relationships between visual search patterns and physiological response (heart rate). A cluster analysis of visual search variables (fixation duration, fixation location difference score, and number of fixations) produced an Efficient Scan and an Inefficient Scan group. Specifically, the Efficient Scan group demonstrated longer total fixation duration and differences in area of interests (AOI) fixation duration compared to the Inefficient Scan group. Despite both groups exhibiting a rise in physiological stress response (HR) throughout the high-stress scenario, the Efficient Scan group had a history of tactical training, improved return fire performance, had higher sleep time total, and demonstrated increased processing efficiency and effective attentional control, due to having a background of increased tactical training.

With over 72,000 offenses between 2010 and 2020 in the USA, knives were the third most commonly used weapon in all violent crimes between behind personal weapons and handguns.PURPOSE:Examine the performance of different stab (Thrust and overhead) and slash (Figure 8 and Reverse) knife motions to determine how long it takes to execute each motion. In addition, examine the variability in executing each motion to inform future self-defense strategies.METHODS:Twenty subjects (Females, n = 4; Males, n = 16; Height: 179.96 ± 8.66 cm; Weight: 94.99 ± 22.37 kg; Age: 36.95 ± 10.63 years) who were all active-duty law enforcement officers (LEOs) with 13.52 ± 11.23 years of LEO experience were recruited to participate in the study. Each subject completed two trials of the knife motions while wearing wearable motion sensors (ADPM) and recorded with a high-speed camera (GoPro) while using a training knife (Cold Steel).RESULTS:The time to complete the motions were: Thrust, 0.61 ± 0.15 s; Overhead, 0.68 ± 0.14 s; Figure 8, 1.07 ± 0.21 s; and Reverse, 0.62 ± 0.11 s. The Figure 8 motion was significantly slower than the other three motions: F (3, 57) = 101.19, p < 0.001, ηp2 = 0.84. The reliability analysis reported trivial variability and a high level of agreement: Thrust, ICCα = 0.701, SEM = 0.09 s, CV% = 15.02; Overhead, ICCα = 0.878, SEM = 0.05 s, CV% = 6.93; Figure 8, ICCα = 0.906, SEM = 0.07 s, CV% = 6.25, Reverse, ICCα = 0.420, SEM = 0.10 s, CV% = 17.31.DISCUSSION:Most LEOs or civilians within striking distance of someone with a knife may not be able to avoid contact from the knife attacks based on the speed knife attacks could occur.CONCLUSION:The reference data provides pertinent information to update evidence-based training approaches to knife attack preparation and defense.

Potentially lethal blue-on-blue (i.e. officer-on-officer) encounters result in the use-of-force against an unidentified officer, such as an off-duty or undercover officer (OD/UC), and have not been empirically investigated. A vignette involving an ambiguous situation involving a plainclothes individual with a gun and 6-item survey were used to determine (a) how o xfb03;cers would respond to ensure the safety of those on scene and (b) how well responses from participants with blue-on-blue training or lived experience adhered to recommendations from the New York Task Force on Police-on-Police Shootings. A secondary aim was to investigate near misses (i.e. almost using force against a fellow officer in the field). In the vignette, a uniformed officer arrives at a scene where one plainclothes individual is holding another plainclothes individual at gunpoint. Thematic analysis revealed variables perceived to maximize safety. Less than half of the sample received blue-on-blue training, and exposure to training was not significantly related to previous recommendations. Implications for policy and practice are discussed.

We conducted empirical analyses of training at 3 large regional police academies in the United States. We objectively examined the performance and learning of 3 classes, a total of 115 cadets, across 3 representative training approaches to defensive and control tactics. Experiment 1 examined the content and effects of single-session or block training across 8 weeks during the academy. Experiment 2 examined the content and effects of spaced sessions with small-group practice and scenario-based feedback across 8 weeks during the academy. Experiment 3 examined the content and effect of block training with scenario-based feedback across 15 weeks during the academy. Experiment 3 also demonstrated the impact of performance feedback on instructor behavior and cadet performance during the academy and 16 weeks after graduation. We provide recommendations and a call for research based on the performance and learning literature, grounded in behavioral science.

Empirical analysis of the contexts in which UDs occur in law enforcement have only recently begun to emerge. We analyzed a novel sample of UD reports (N = 171) that occurred between 1992 and 2016, collected from one non-U.S. and three U.S. law enforcement entities. Using an established antecedent-behavior-consequence (A-B-C) taxonomy, reports were analyzed by context, officer behavior, type of firearm, injuries, deaths, and property damages. This study is the first to empirically document reports of UDs caused by the startle response and the first to analyze a substantial sample of UDs that involved handguns with a double-action only trigger mechanism. An expanded analysis of UD consequences suggested that deaths and injuries might be more prevalent than previously reported.

The purpose of this study was to measure the amount of error incurred by police officers when trying to accurately draw a previously completed movement path, which occurred during their response to a high-stress encounter. Secondary purposes of the study examined whether gridlines on a diagram or a distractor situation would influence memory accuracy. Officers (n=23) were taken through a high-stress stimulus phase, followed by a memory recall phase where they were required to accurately draw their path of travel. Average distance traveled was 5.15 +/- 1.98m. Average discrepancy for all participants was an area of 3.23 +/- 4.13m(2) and length of 1.43 +/- 1.30m. Significant length differences were found between actual and recalled paths of travel (p<.01). No other significant area or length differences were found.

An unintentional discharge (UD) is an activation of the trigger mechanism that results in an unplanned discharge that is outside of the firearm's prescribed use. UDs can result in injury or death, yet have been understudied in scientific literature. Pre-existing (1974-2015) UD reports (N = 137) from seven law enforcement agencies in the United States of America were analyzed by context, officer behavior, type of firearm, and injuries. Over 50% of UDs occurred in contexts with low threat potential while engaged in routine firearm tasks. The remaining UDs occurred in contexts with elevated to high threat potential during muscle co-activation, unfamiliar firearm tasks, contact with inanimate objects, and a medical condition. An antecedent-behavior-consequence (A-B-C) taxonomy as well as a standardized reporting form, based on the current findings and the existing literature, are offered as tools for identifying the conditions under which UDs may be likely to occur. (C) 2016 Elsevier Ltd. All rights reserved.

Investigations after critical events often depend on accurate and detailed recall accounts from operational witnesses (e.g., law enforcement officers, military personnel, and emergency responders). However, the challenging, and often stressful, nature of such events, together with the cognitive demands imposed on operational witnesses as a function of their active role, may impair subsequent recall. We compared the recall performance of operational active witnesses with that of nonoperational observer witnesses for a challenging simulated scenario involving an armed perpetrator. Seventy-six police officers participated in pairs. In each pair, 1 officer (active witness) was armed and instructed to respond to the scenario as they would in an operational setting, while the other (observer witness) was instructed to simply observe the scenario. All officers then completed free reports and responded to closed questions. Active witnesses showed a pattern of heart rate activity consistent with an increased stress response during the event, and subsequently reported significantly fewer correct details about the critical phase of the scenario. The level of stress experienced during the scenario mediated the effect of officer role on memory performance. Across the sample, almost one-fifth of officers reported that the perpetrator had pointed a weapon at them although the weapon had remained in the waistband of the perpetrator's trousers throughout the critical phase of the encounter. These findings highlight the need for investigator awareness of both the impact of operational involvement and stress-related effects on memory for ostensibly salient details, and reflect the importance of careful and ethical information elicitation techniques.

This study aimed to examine the level of shooting accuracy demonstrated by law enforcement recruits upon completion of their law enforcement firearms training in comparison with novice shooters. One hundred and ninety-five male and 52 female law enforcement recruits volunteered. Participants were separated by firearms experience into the following groups: expert (completed law enforcement firearms course, n = 83), intermediate (recreational experience, n = 71) and novice (minimal/no experience, n = 93). All subjects were tested for accuracy at target locations from 3 to 75 ft. For all locations, no difference was found in accuracy between expert and intermediate groups ( p > 0.30). Experts and intermediates had better results than novices on all locations ( p < 0.05) except from 3 to 15 ft. Alarmingly, experts were only 10% more accurate than novices between 3 and 15 ft. Finally, novices and intermediate shooters were more likely to hit head locations from 3 ft (57%), whereas experts mainly hit the body location (78%). The results of this study indicate that officers had no advantage over intermediate shooters and a small advantage over novices.

Recently, the threat of ambush assaults to police officers has dangerously increased. These assaults can occur very rapidly, and to be better prepared to respond, it is important to understand the speed of officer responses and any advantages officers may gain from various tactical techniques. Therefore, the purpose of this study was to understand and examine officer movement times from various finger-indexing positions as well as the speed at which officers can fire their weapons from various starting positions. In the first experiment, officers (n = 52) fired their weapons from four trained finger-index positions to measure their time to fire. In the second experiment, officers (n = 68) fired their weapons from various starting, or tactically ready, positions to measure the speed of movement to weapon discharge. Results of Part One showed that contrary to training, all indexing positions were similar in time to contact the trigger, except indexing high on the slide. Part Two revealed that point shooting was significantly faster than aimed shooting as well as that the Low-Ready position was the fastest from which to fire, and the High-Guard ready position was the slowest. These results may provide analytical and training implications to improve the safety of officers.

Erectile dysfunction is a major complication affecting the quality of life of patients and partners after radical prostatectomy. Evolving evidence suggests that early penile rehabilitation may provide better erectile function after surgery. Phosphodiesterase type 5 (PDE-5) inhibitors are routinely considered a first-line treatment option in most algorithms for penile rehabilitation owing to their efficacy, ease of use, wide availability and minimal morbidity. Tadalafil is a long-acting, potent PDE-5 inhibitor for erectile dysfunction, with demonstrated effect in animal studies at preserving penile smooth muscle content and prevention of fibrosis of cavernosal tissue. This article evaluates the existing literature on tadalafil and critically analyzes its impact on erectile function following radical prostatectomy.