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21.
    
Linkage analysis is a crucial part of the investigative process when faced with a possible series of related offences. Establishing behavioural consistency (i.e., offender's behaviours consistently present across the series) is at the core of linkage. Recent empirical studies have found little evidence of consistency looking at either individual or groups of behaviours in serial homicide. It is argued that behavioural changes are rooted in the changing cognitive strategies that offenders use to reach their ultimate goal (i.e. the commission of multiple homicides). Factors that could account for these changes include learning, situational factors, loss of control, and changes in the offender's fantasy. Patterns of behavioural change have been identified in serial crimes, such as rape. However, no empirical studies have looked at patterns of behavioural change in serial homicide. The present study examined patterns of consistency and change using a combination of thematic and behavioural subgroup approaches that use Multidimensional Scaling. Thematic differentiation indicative of behavioural manifestations of cognitive strategies was found in all three examined subgroups: planning, wounding, and offender–victim interaction, and patterns of change within these subgroups provided support for the above theories. Looking at behavioural patterns rather than individual behaviours, may be a more fruitful way of examining consistency in serial homicide, and could have significant implications for linkage analysis. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   
22.
    
This study examined the content of a contemporary sample of behavioural investigative advice reports produced by the National Policing Improvements Agency (NPIA), formally known as the National Centre for Policing Excellence, and compared this sample with previous offender‐profiling samples reported by Alison, Smith, Eastman, and Rainbow in 2003. Forty‐seven reports written in 2005 were content analysed. The reports contained 805 claims, although 96% of the claims contained grounds for their claim, only 34% had any formal support or backing. In terms of confirmability, 70% of the claims were verifiable. However, only 43% were falsifiable, in that they could be objectively measured post‐conviction. Analysis also showed that there were differences when comparing the different types of claims made (i.e. behavioural, temporal) and the different types of reports compiled by the NPIA (i.e. behavioural assessment report, linking report, etc.) Comparisons show that there is a very large positive difference between the contemporary behavioural investigative advice sample and previous non‐NPIA expert advice in terms of the substantiveness of their arguments. Contemporary NPIA behavioural investigative advice has clearer boundaries around the claims made and presents material in a more coherent and evidence‐based format than previous expert advice. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   
23.
    
This research paper presents an examination of the journey to and from crime for auto‐theft offenders in the UK. For 852 offences, ‘wheel’ distances are calculated for triangles formed by offenders' home location, theft location, and vehicle disposal location. The study demonstrates typical isosceles mobility triangles; distances travelled to and from home locations are roughly equal, whereas distances between theft and disposal points were shorter. Distances travelled by offenders under 17 years old and offences involving drug and drink were shown to be shorter than comparison groups. Prolific offenders tend to travel further, although there is significant variation in this subgroup. Explanations and implications are discussed. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   
24.
    
The present study examined offender characteristics, distance patterns, and the nature of disposal sites in rural area homicides. Pre‐trial investigation files of cases where victims' bodies were found in rural areas in 1994–2005 (n = 46) and forensic psychiatric examination reports of the offenders were content‐analysed. Psychopathy Check List‐Revised was used to assess psychopathy. Investigators of these homicides filled out a questionnaire on the offender's familiarity with the body disposal area, and MapInfo was used to measure offender/victim‐residence‐to‐crime‐to‐body‐disposal‐site distances. Rural area homicides more frequently involved multiple offenders who were significantly younger than offenders in other homicides. Of the victims, 73% were found in woods and 27% in water. Offenders were familiar with disposal sites in over half of the cases. The victim's gender, close relationship with the offender, and the offender's violent crime history were associated with longer homicide‐scene‐to‐body‐disposal‐site distances. The number of inhabitants and offender's violent crime history were related to longer offender‐residence‐to‐body‐disposal‐site distances. Offender's age, intelligence, or psychopathology bore no significant association with the distance patterns. The results can be applied when searching missing persons in homicide investigations and in prioritising suspects in rural area homicides. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   
25.
    
Even though geographical offender profiling is already widely used and researched in countries such as England, Canada, and United States, it is still severely overlooked in Brazil, as there are no researches on the subject using a Brazilian sample. Therefore, the present paper aims to start filling this gap by analysing the applicability of the geographical offender profiling and Dragnet on a sample of Brazilian serial killers. In order to achieve this objective, the authors collected data through police records on 15 serial killers that were active between June 2009 and June 2015, in the city of Campina Grande, Paraíba, Brazil. As a result, the circle hypothesis was confirmed, considering that 66.7% of the sample fell into the marauder category. Interestingly, the Dragnet's result accurately informed the area that contained the offender's base in the same cases in which the offender acted according to the marauder model. Also, other important correlations were found such as the influence of age, intelligence, resourcefulness, and method of approach on the distance travelled to commit a murder. Those results show that the geographical offender profiling can be effectively applied in Brazil and thus is a valid investigative tool to aid police officers in serial crimes investigations.  相似文献   
26.
    
Research on sex offenders has mainly guided clinical practice for risk assessment and therapeutic intervention. However, the current scientific knowledge on these offenders and their crimes is, in many aspects, of great importance to criminal investigations. Consequently, there is a need to build bridges between investigative psychology and the research being conducted on sex offenders. Four areas of research on sex offenders that have clear implications to investigative psychology can be identified: (1) the consistency or ‘crime‐switching’ patterns of sex offenders; (2) the recidivism patterns of different types of sex offenders; (3) the police response to specific victim characteristics; and (4) the A → C equation of sexual assaults. This paper argues for a need to establish a dialogue between these two fields of research so that knowledge about sex offenders keeps growing whilst being able to inform policing practices in investigative psychology. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   
27.
    
Although it is now well established across diverse samples that the frequency of offending ‘decays’ as distance from the home/base increases, it remains unclear what form of decay function best characterises this relationship. Different forms of decay function reflect different patterns and rates of decrease in the likelihood of offending as distance from the home/base increases. These different patterns imply rather different underlying psychological processes. Therefore, considerations of the particular function characterising distance decay elucidate explanations of offender spatial behaviour. To bring to light the possible psychological and behavioural processes inherent in offending distance decay, the present study examined the fit of logarithmic, negative exponential, and quadratic decay functions to the distribution of the distances travelled to offend by a sample of 70 prolific burglars from the UK. It is argued that these functions are consistent with the operation of perceptual processes of magnitude estimation, friction or effort effects, and the influences of cost‐benefit assessments, respectively. The results indicate that offending distance decay patterns most closely fit the logarithmic function, consistent with Stevens' perceptual processes of distortion in magnitude estimation, whilst not ruling out additional processes relating to the increased effort required in travelling greater distances to offend. Because most geographical profiling systems are built upon the distance decay function, the impact of utilising the different forms of function on the accuracy of geographic profiles was also assessed utilising ‘search cost’ calculations. The results showed little impact of applying different decay functions. Thus, whilst the decay function does have important theoretical implications for understanding offender spatial behaviour, it is noted that the particular variant used does not significantly impact on the effectiveness of geographical profiling systems as they currently exist. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   
28.
    
Likelihood surface methods for geographic offender profiling rely on several assumptions regarding the underlying location choice mechanism of an offender. We propose an ex ante test for checking whether a given set of crime locations is compatible with two necessary assumptions: circular symmetry and distance decay. The proposed (SDD) test compares the observed inter point distances of a given series of crimes with a theoretical distribution function governed by these assumptions, using a Monte Carlo simulation procedure for approximating that distribution function. We apply the SDD test to data on serial burglary from both the UK and the Netherlands. In most cases, the assumption of an underlying symmetric distance decay function has to be rejected. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   
29.
    
This paper considers the role of a Behavioural Investigative Adviser (BIA) in assisting with the decision‐making of a Senior Investigating Officer (SIO) in difficult‐to‐detect murder investigations. It outlines the need for transparent evidence‐based decision‐making from both the SIO and the BIA. The paper then details a piece of relevant, applied research that can assist in this end. The research utilised a pragmatic psychology approach to analyse 312 detected murder cases from the Serious Crime Analysis Section database. Some significant patterns relating what is known about the offence at different stages of an investigation and inferences regarding the offender were found, indicating that certain offence information can lead to some reliable predictions and these can be refined as more information becomes available. However, the findings also indicate that base rate frequencies and a ‘best‐guess’ methodology may be as, if not more, useful than more complex statistical techniques when providing advice to investigations. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献   
30.
    
This paper uses police data on a sample of 41 serial burglars committed in the city of St John's, Canada and surrounding areas, to examine individual differences in distances travelled. In accord with findings from studies in other locations, results show that serial burglary is a localised activity. Differences between serial burglars in distances they travel are related to the burglars' age, method of transportation and value of property stolen. These results are discussed in terms of existing explanations of distances that serial burglars travel to select targets and implications for police decision‐making. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   
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