Use Of Force Research Articles

Police Use of Force in Mental Health Crises: An Analysis of Coronial Inquest Findings from Australia

Police are frequently the initial responders to situations involving individuals experiencing a mental health crisis. These situations sometimes escalate to the point where police resort to the use of force, resulting at times in injury and, less often, loss of life. This study draws on data from coronial inquest reports of cases involving police use of fatal force against persons with mental illness from one Australian jurisdiction. It examines the contextual factors leading up to these incidents, the personal backgrounds and mental health histories of the individuals in crisis, and the tactical approaches employed by police leading to the use of deadly force. Understanding these insights is crucial as they can potentially guide efforts to reform police practices in dealing with individuals in mental health crises and ultimately may help to prevent fatal outcomes.

Partners in Force? Understanding Police Use of Force from a Network Perspective

Partners in Force? Understanding Police Use of Force from a Network Perspective

The impact of a brief and immersive use-of-force training exercise on citizens’ attitudes toward police

Purpose Citizens’ attitudes toward police (ATP) have declined dramatically in recent years, prompting many agencies to implement police–community relations programs designed to build back the community’s trust. Such programs are often time-intensive, requiring many hours to complete. The current study examined the impact of a brief (approximately 15 minutes) community relations intervention on citizens’ ATP and police use of force (UoF).Design/methodology/approach A sample of 104 citizens completed three UoF training exercises (i.e., the intervention) inside a video simulator at a municipal police department. Immediately before and after the intervention, citizens’ ATP and police UoF were recorded.Findings Despite having relatively favorable impressions of police at baseline, many attitudes grew to be more favorable following the intervention, including perceptions of job difficulty and the belief that police are treated too harshly by the media. While global impressions of the police did not change, citizens came to believe that greater UoF levels were warranted in specific types of encounters, such as when a suspect tries to strike an officer.Originality/value These findings suggest that providing citizens with an opportunity to experience UoF decision-making first-hand can positively impact certain ATP and police work. Law enforcement agencies may find that such brief, immersive interventions are useful tools for improving police–community relations.

Tailoring stiffness distribution of tendon-driven continuum finger from manipulation force vector

Continuum soft-robotic fingers/arms have emerged as a promising solution to realize abilities to delicately manipulate objects, conform to various shapes, and maintain cost-efficiency (i.e. fewer actuators and less computational resource). This paper introduces a novel approach to designing continuum flexible fingers by optimizing the fingers' thickness distribution to achieve specific target force vectors for specific manipulations, enabling actions like pull-in handing (retraction), push-out manipulation, secure grip, and gentle object hold. The proposed method employs a genetic algorithm to optimize the thickness distribution of the continuum finger driven by a single motor, resulting in a highly versatile and cost-effective solution. The proposed method includes physical simulations to validate the approach's effectiveness in applying desired force vectors during manipulation interactions. This work represents a significant advancement in continuum robotic systems, potentially impacting a wide range of applications in human-robot collaboration.

Social and policy characteristics associated with injurious shootings by police in US counties: A multilevel analysis, 2015-2020.

From 2015 to 2020, shootings by police injured or killed 1769 people annually in the United States, disproportionately harming members of minoritized groups. Prior studies of the structural determinants of these inequities have largely examined state-level aggregations and fatal outcomes. This study aimed to: 1) describe state and county variation in fatal and nonfatal injurious shootings by police, and 2) analyze the relationship between state and county context and differences in county rates of injurious shootings by police. Injury data were developed from manual review of incidents listed in the Gun Violence Archive, then aggregated by county-year. Covariate selection was informed by theories of police use of force and the Social Basis of Disparities in Health conceptual framework. Fixed effects negative binomial regression models were estimated, nesting years within counties and states. Analyses controlled for county population, local reporting presence, and multiple measures of social conflict and community violence. From 2015 to 2020, 56% of counties experienced injurious shootings by police. Higher county rates of victimization were associated with greater state spending on police relative to health, county income inequality, prevalence of unmet substance use disorder needs, higher county firearm availability, and permitless concealed carry statutes. Firearm purchaser licensing polices were associated with lower incidence of injurious shootings by police. To prevent patterns of injurious shootings by police, policymakers should consider addressing undermanaged substance use disorder through crisis fund allocation and use, adopting stronger firearm licensing systems, and evaluating local strategies to combat inequities and strengthen non-policing responses to social needs.

Effects of a DC offset on an electrothermal microparticle trap assembled with an AC electric field

Micro and nano-scale colloidal particles can be rapidly assembled at electrode-electrolyte interfaces in highly organized structures. These particles aggregate through various forces which are, among others, chemical, electrical, and thermal in nature. Patterning biological cells in such structures has high impact applications but it remains a challenge due to their limited viability under said manipulation forces. Rapid electrokinetic patterning (REP) uses AC electrothermal micro-vortices to aggregate both synthetic particles and biological cells. In this work, we explore the effects of a DC offset on a REP trap performance in bio-relevant isotonic medium. REP traps were characterized by measuring the inter-particle distance under different DC offsets, using a Delaunay triangulation. The inter-particle distance was measured in a steady-state trap followed by the disassembly of the aggregate as the REP vortex was turned off. DC offset enhanced the trapping performance for micro-particles suspended in a sugar-based isotonic medium. It was observed that an increasingly negative DC offset increased the steady-state inter-particle distance and reduced the rate of disassembly. However, no such trend was found with positive DC offsets. Changing the offset in small steps (<500 mV) affected only the inter-particle distance whereas, larger steps significantly affected the trap stability and size.

DNA Mechanics: From Single Stranded to Self-Assembled.

DNA encodes genetic information and forms various structural conformations with distinct physical, chemical, and biological properties. Over the past 30 years, advancements in force manipulation technology have enabled the precise manipulation of DNA at nanometer and piconewton resolutions. This mini-review discusses these force manipulation techniques for exploring the mechanical properties of DNA at the single-molecule level. We summarize the distinct mechanical features of different DNA forms while considering the impact of the force geometry. We highlight the role of DNA mechanics in origami structures that serve as self-assembled building blocks or mechanically responsive/active nanomachines. Accordingly, we emphasize how DNA mechanics are integral to the functionality of origami structures for achieving mechanical capabilities. Finally, we provide an outlook on the intrinsic mechanical properties of DNA, from single stranded to self-assembled higher-dimensional structures. This understanding is expected to inspire new design strategies in DNA mechanics, paving the way for innovative applications and technologies.

Juror Decision-Making in a Case Involving Police Use of Force: The Impact of Defendant Race, Victim Race, and Victim Gender on Verdict and Perceptions

In recent years, cases of police use of force have been making headlines and sparked a global conversation about racial bias in policing. As such, the current study aimed to uncover how race and gender impact juror decision-making in a case involving mistaken identity by police. We hypothesized that mock-jurors would be more likely to assign guilty verdicts and have a more negative perception of the defendant when the defendant is White versus Indigenous, and when the victim is White and female. Mock-jurors (N = 229) read one of eight fictional trial transcripts, provided a dichotomous verdict, and responded to questions regarding their perceptions of the defendant and the victim. While there was no significant impact on the dichotomous verdict or continuous guilt, the mock-jurors had a significantly more favourable perception of the Indigenous defendant.

Combinatory electric-field-guided deposition for spatial microparticles patterning

Spatial deposition and patterning of microparticles are crucial in chemistry, medicine, and biology. Existing technologies like electric force manipulation, despite precise trajectory control, struggle with complex and personalized patterns. Key challenges include adjusting the quantity of particles deposited in different areas and accurately depositing particles in non-continuous patterns. Here, we present a rational process termed combinatory electric-field-guided deposition (CED) for achieving spatially regulated microparticle deposition on insulative substrates. This process involves coating the substrates with insulating materials like PVP and positioning it on a relief-patterned negative electrode. The negative electric field generated by the electrode attracts microparticles, while the positive surface charges on the substrates repel microparticles, resulting in the formation of a potential well over the electrode area. Consequently, this configuration enables precise control over microparticle deposition without the need for direct contact with the substrate's surface, simplifying the process of switching masks to meet varying microparticle deposition requirements. Furthermore, we demonstrate the customization of patterned microparticles on superhydrophobic coatings to regulate cell distribution, as well as the successful loading of drug-laden microparticles onto antibacterial bandages to match the areas of skin lesions. These applications underscore the versatility of CED across chemical, medical, and bioengineering domains.

"Surface-Like Growth" Strategy for the Direct Synthesis of Horizontally Aligned Boron Nitride Nanotubes.

The inherent properties of boron nitride nanotubes (BNNTs) can be further enhanced through the control of their anisotropy. In particular, horizontally aligned BNNTs (HABNNTs) exhibit considerable potential for various applications. However, directly synthesizing HABNNTs is difficult owing to the random floating of BNNTs and the absence of directional forces. Here, we employed a simple, efficient, and universal "surface-like growth" strategy to synthesize high-density and high-quality HABNNTs in the W2B5/Zn precursor system. First, the floating range of BNNTs was restricted to the vicinity of the precursor, and then, directional forces were applied to induce BNNT directional growth along the substrate surface. Experiments and simulations confirmed that the HABNNT orientation could be controlled through manipulation of the directional forces. Furthermore, the strategy was employed for HABNNTs synthesis using the MoB2/Zn, further demonstrating the universality of the approach. Overall, this work offers a fresh perspective on the synthesis of HABNNTs, further expanding their potential applications.

University students’ accounts of police use of force: implications for trust in the police

ABSTRACT This empirical research explores the effect of police use of excessive force on university students’ trust in the police. Although the use of force by the police has continued to resonate in academic discourse, particularly from developed Western societies, the challenge is that there is a dearth of empirical research that precisely measures police use of excessive force among university students and how it shapes their trust in the police. The few existing studies were drawn from the general population survey, and they showed that the police in most African transitional societies tend to misuse their powers and are typically unaccountable to the public. From a survey data of participants delineated to a large public university in South Africa, this study specifically assessed the effect of direct experience of police abuse, vicarious experience of police abuse, experience of police corruption, and predatory policing on university students’ trust in the police. Findings confirmed, among others, that police use of excessive force (direct and vicarious experience of police abuse and predatory policing) significantly negatively affects students’ trust in the South African Police Service (SAPS). The implications of the findings for effective policing in the country are discussed.

Reversible switching of supramolecular self‐assembly between nanofibers and nanorings based on perylene‐terminated star elastomers

AbstractPerylene‐terminated star elastomers (PSE) containing the diblock copolymers of polystyrene (PS) and polyisoprene (PI) segments were designed and synthesized by anionic polymerization. The PSE exhibits good fluorescence performances in solution, self‐assembled aggregates, and solid state. Different supramolecular self‐assemblies in tetrahydrofuran (THF) solution based on the π−π stacking of perylene and interactions in PS can be observed from nanofibers to twisted multi‐nanoropes. Moreover, the twisted nanoropes under ultrasonic can transform spontaneously into nanorings in the stationary state, and reversibly switch between twisted nanoropes and nanorings via the manipulation of ultrasonic force. The terminating methods will offer considerable scope for the design and synthesis of new star elastomers. Meanwhile, a new insight into π−π stacking and interactions is provided for understanding multistep and cooperative self‐assembly in supramolecular self‐assembly.

Who needs a tourniquet? And who does not? Lessons learned from a review of tourniquet use in the Russo-Ukrainian war.

Extremity tourniquets have proven to be lifesaving in both civilian and military settings and should continue to be used by first responders for trauma patients with life-threatening extremity bleeding. This is especially true in combat scenarios in which both the casualty and the first responder may be confronted by the imminent threat of death from hostile fire as the extremity hemorrhage is being treated. Not every extremity wound, however, needs a tourniquet. One of the most important aspects of controlling life-threatening extremity bleeding with tourniquets is to recognize what magnitude of bleeding requires this intervention and what magnitude of bleeding does not. Multiple studies, both military and civilian, have shown that tourniquets are often applied when they are not medically indicated. Overuse of extremity tourniquets has not caused excess morbidity in either the recent conflicts in Iraq and Afghanistan or in the US urban civilian setting. In the presence of prolonged evacuation, however, applying a tourniquet when it is not medically indicated changes tourniquet application from being a lifesaving intervention to one that may cause an avoidable amputation and the development of an array of metabolic derangements and acute kidney injury collectively called prolonged tourniquet application syndrome. The recent literature was reviewed for papers that documented the complications of tourniquet use resulting from the prolonged casualty evacuation times being seen in the current Russo-Ukrainian war. The literature was also reviewed for the incidence of tourniquet application that was found to not be medically indicated, in both the US civilian setting and from Ukraine. Finally, an in-person meeting of the US/Ukraine Tourniquet Working Group was held in Warsaw, Poland, in December of 2023. Unnecessary loss of extremities and life-threatening episodes of prolonged tourniquet application syndrome are currently occurring in Ukrainian combat forces because of nonindicated tourniquet use combined with the prolonged evacuation time seen in the Russo-Ukrainian war. Specific numbers of the complications experienced as a result of tourniquet use by Ukrainian forces in the current conflict are treated as classified information and are not available, but multiple sources from the Ukrainian military medical personnel and from the US advisors providing medical assistance to Ukraine have all agreed that the problem is substantial. Unnecessary tourniquet morbidity might also occur in US forces in a variety of potential future combat scenarios in which evacuation to surgical care is delayed. Prehospital trauma training programs, including but not limited to tactical combat casualty care, place insufficient emphasis on the need to avoid leaving tourniquets in place when they are not medically indicated. This aspect of training should receive emphasis in future Tactical Combat Casualty Care (TCCC) and civilian first responder curriculum development. An interim ad hoc training solution on this topic is available at the websites noted in this articles. Additional training modalities may follow in the near future. Therapeutic/Care Management; Level V.

Anatomy and Microsurgical Relevance of the Outer Arachnoid Envelope around the Olfactory Bulb Based on Endoscopic Cadaveric Observations.

There is high risk of injury to the olfactory tract and olfactory bulb during surgery of the anterior cranial fossa. The goal of this study was to describe the outer arachnoid envelope around the olfactory bulb, which plays a significant role in approach-related injury of the nerve. A total of 20 fresh human cadaveric heads were examined. Five cadaveric heads were used to describe a gross overview of the topographic anatomy of the outer arachnoid cover of the olfactory bulb. In 15 cadaveric heads, endoscopic surgical approaches were performed to examine the in situ undisrupted anatomy of the outer arachnoid around the olfactory bulb. Four cadaveric heads were used for the lateral subfrontal approach, 5 heads for the medial subfrontal approach, 3 heads for the median subfrontal approach, and 3 heads for the anterior interhemispheric approach. The outer arachnoid membrane of the frontal lobe attaches the olfactory bulb strongly to the above lying olfactory sulcus. Only the most rostral portion of the olfactory bulb became slightly detached from the frontal lobe. The outer arachnoid forms a decent protrusion around the tip of the olfactory bulbs. The fila olfactoria have their own outer arachnoid cover as a continuation of the same layer of the olfactory bulb. The effect of brain retraction and manipulation forces on the olfactory bulb and the role of the arachnoid membranes located here were visually analyzed and described in detail through the four different neurosurgical approaches we performed. The results of our observations provide important anatomical details for preserving the sense of smell during neurosurgical procedures.

Behind the yellow sticker: paradoxical effects of a visual warning of body-worn cameras on the use of police force

Behind the yellow sticker: paradoxical effects of a visual warning of body-worn cameras on the use of police force

‘I was having an anxiety attack and they pepper sprayed me': police apprehension in mental health contexts in Australia

ABSTRACT Police attendance in mental health contexts is often traumatic for the person in crisis, their family and first responders. Existing literature on police involvement in mental health responses tends to focus on police perspectives. Scholarship exploring lived experience perspectives is limited, yet is crucial for informing programmes, policies and reforms. We present findings from one of the first projects co-produced with people with lived experiences of being apprehended by police under mental health legislation. Interviews were conducted with twenty participants who had experience(s) of police apprehension across Australia. Findings highlight the social disadvantage experienced by participants prior to being apprehended and that use of force (such as tasering, pepper spraying and restraining in locked police vans) was common and over-used. Our study identified that police apprehension has lasting and wide-ranging impacts, leading to loss of employment, trauma, property damage, negative self-perceptions, discrimination, and fear of future police responses. Some participants were also apprehended by police while experiencing family violence and were misidentified as perpetrators. We argue police use of force mirrors the use of force within mental health services, with participants not experiencing a clear separation between police and mental health responses. The article shares participants’ ideas for change, including response models based on human rights, police non-attendance and peer-led initiatives. Our findings suggest the need for investment in alternatives to police responses and further research involving lived experience perspectives to inform out understanding of mental health crisis responses.

Racial Disparities in Civilian Response to Police Use of Force: Evidence From London

Abstract This study explores the impact of police use of force on civilian interactions with the police, focussing on neighbourhoods with different ethnic compositions across London. Analysing the effects of three notable police-induced civilian fatalities as well as monthly fluctuations in the Metropolitan Police Service’s use of force, I find a decrease in reported crime and the proportion of crime without a suspect in Black neighbourhoods. These patterns suggest avoidance of police engagement, especially for crimes less likely to be solved. Individual survey data suggests no changes in victimization probabilities for any ethnic group, suggesting that estimates are due to reporting behaviour.

The United States, the People’s Republic of China, and the Defence of Taiwan

ABSTRACT This article examines the current rivalry between the United States and the People’s Republic of China with a focus on the issue of Taiwan. A central question is whether Washington should change its current deterrence approach towards a possible Chinese invasion of Taiwan, moving from a policy of ‘strategic ambiguity’ about the potential of American military intervention to one based on ‘strategic clarity’ that commits US forces in advance to Taiwan’s defence. The article draws on deterrence theory, notably the so-called three Cs of deterrence (capability, commitment, and communications), and makes the case that a shift from strategic ambiguity to clarity will be necessary to uphold deterrence against a potential Chinese invasion of Taiwan.

A Critical Overview of Islamic State of Iraq and Syria (ISIS)’s Origin, Goals, and Its Fall through the US and Allied Forces

The origins of ISIS were traced to the Arab Spring that created instability in the Middle East. This instability was exacerbated by the American-led coalition's invasion of Iraq in 2003, prompted by the 9/11 attacks. The paper aims to have an overview of the origin and goals of the Islamic State of Iraq and Syria (ISIS) and the strategies employed by the U.S. and Allied Forces to make ISIS fall. A systematic literature review approach was adopted to review the selected literature. ISIS was formed out of various militant groups in the country whose goal is to establish an Islamic caliphate governed by strict Sharia law. The goal of ISIS was to establish an Islamic caliphate in Iraq, Syria, and beyond with a caliph as the leader of the territories, thereby eradicating state borders and governments they deemed to be illegitimate. This caliphate is to be governed by strict Sharia law. This analysis delves into the strategies used by the US-led coalition to reclaim territories from ISIS. These strategies include military strategies, economic strategies, political strategies, and social strategies. It was, therefore, recommended that to combat ISIS's ideology effectively, the United States may need to collaborate more with Muslim clerics all over the world to promote interpretations of the Quran that counter radicalization in Islam.

Force manipulability-oriented manipulation planning for collaborative robot

PurposeCollaborative robots (cobots) are widely used in various manipulation tasks within complex industrial environments. However, the manipulation capabilities of cobot manipulation planning are reduced by task, environment and joint physical constraints, especially in terms of force performance. Existing motion planning methods need to be more effective in addressing these issues. To overcome these challenges, the authors propose a novel method named force manipulability-oriented manipulation planning (FMMP) for cobots.Design/methodology/approachThis method integrates force manipulability into a bidirectional sampling algorithm, thus planning a series of paths with high force manipulability while satisfying constraints. In this paper, the authors use the geometric properties of the force manipulability ellipsoid (FME) to determine appropriate manipulation configurations. First, the authors match the principal axes of FME with the task constraints at the robot’s end effector to determine manipulation poses, ensuring enhanced force generation in the desired direction. Next, the authors use the volume of FME as the cost function for the sampling algorithm, increasing force manipulability and avoiding kinematic singularities.FindingsThrough experimental comparisons with existing algorithms, the authors validate the effectiveness and superiority of the proposed method. The results demonstrate that the FMMP significantly improves the force performance of cobots under task, environmental and joint physical constraints.Originality/valueTo improve the force performance of manipulation planning, the FMMP introduces the FME into sampling-based path planning and comprehensively considers task, environment and joint physical constraints. The proposed method performs satisfactorily in experiments, including assembly and in situ measurement.