Understanding the factors that may impact the transfer, persistence, prevalence and recovery of DNA (DNA-TPPR), and the availability of data to assign probabilities to DNA quantities and profile types being obtained given particular scenarios and circumstances, is paramount when performing, and giving guidance on, evaluations of DNA findings given activity level propositions (activity level evaluations). In late 2018 and early 2019, three major reviews were published on aspects of DNA-TPPR, with each advocating the need for further research and other actions to support the conduct of DNA-related activity level evaluations. Here, we look at how challenges are being met, primarily by providing a synopsis of DNA-TPPR-related articles published since the conduct of these reviews and briefly exploring some of the actions taken by industry stakeholders towards addressing identified gaps. Much has been carried out in recent years, and efforts continue, to meet the challenges to continually improve the capacity of forensic experts to provide the guidance sought by the judiciary with respect to the transfer of DNA.
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Background & Aim:Technological innovations enable rapid DNA analysis implementation possibilities. Concordantly, rapid DNA devices are being used in practice. However, the effects of implementing rapid DNA technologies in the crime scene investigation procedure have only been evaluated to a limited extent.In this study, the rapid DNA procedure at the crime scene was compared with a regular DNA procedure. We investigated the DNA-results of the RapidHIT200 on blood and saliva traces secured at the crime scene, and the impact of these rapid DNA profile results on the investigative process & DNA Hits.
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In this study, we assessed to what extent data on the subject of TPPR (transfer, persistence, prevalence, recovery) that are obtained through an older STR typing kit can be used in an activity-level evaluation for a case profiled with a more modern STR kit. Newer kits generally hold more loci and may show higher sensitivity especially when reduced reaction volumes are used, and this could increase the evidential value at the source level. On the other hand, the increased genotyping information may invoke a higher number of contributors in the weight of evidence calculations, which could affect the evidential values as well. An activity scenario well explored in earlier studies [1,2] was redone using volunteers with known DNA profiles. DNA extracts were analyzed with three different approaches, namely using the optimal DNA input for (1) an older and (2) a newer STR typing system, and (3) using a standard, volume-based input combined with replicate PCR analysis with only the newer STR kit. The genotyping results were analyzed for various aspects such as percentage detected alleles and relative peak height contribution for background and the contributors known to be involved in the activity. Next, source-level LRs were calculated and the same trends were observed with regard to inclusionary and exclusionary LRs for persons who had or had not been in direct contact with the sampled areas. We subsequently assessed the impact on the outcome of the activity-level evaluation in an exemplary case by applying the assigned probabilities to a Bayesian network. We infer that data from different STR kits can be combined in the activity-level evaluations.
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Evaluations of forensic observations considering activity level propositions are becoming more common place in forensic institutions. A measure that can be taken to interrogate the evaluation for robustness is called sensitivity analysis. A sensitivity analysis explores the sensitivity of the evaluation to the data used when assigning probabilities, or to the level of uncertainty surrounding a probability assignment, or to the choice of various assumptions within the model. There have been a number of publications that describe sensitivity analysis in technical terms, and demonstrate their use, but limited literature on how that theory can be applied in practice. In this work we provide some simplified examples of how sensitivity analyses can be carried out, when they are likely to show that the evaluation is sensitive to underlying data, knowledge or assumptions, how to interpret the results of sensitivity analysis, and how the outcome can be reported. We also provide access to an application to conduct sensitivity analysis.
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In this case study, we want to gain insights into how residents of three municipalities communicate about the new murder scenario of the cold case of Marianne Vaatstra and the possibility of a large-scale DNA familial searching. We investigate how stakeholders shape their arguments in conversation with each other and with the police. We investigate the repertoires that participants use to achieve certain effects in their interactions with others in three focus groups. The results show that the analyzed repertoires are strong normative orientated. We see two aspects emerge that affect the support for large-scale DNA familial searching. These are: 1. Cautious formulations: respondents showed restraint in making personal judgments and often formulated these on behalf of others. Participants would not fully express themselves, but adjusted to what seemed the socially desirable course. 2. Collective identity: respondents focused on the similarities between themselves and the needs, interests, and goals of other participants. Participants also tried in a discursive way to convince each other to participate in the large-scale familial searching. These two major discursive activities offered the communication discipline guidance for interventions into the subsequent communication strategy.
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In May 2018, the new Dutch Intelligence and Security Services Act 2017 (Wet op de Inlichtingen- en veiligheidsdiensten, Wiv) will enter into force. It replaces the previous 2002 Act and incorporates many reforms to the information gathering powers of the two intelligence and security services as well as to the accountability and oversight mechanisms. Due to the technologyneutral approach, both the civil and the military intelligence services are now authorized to, for example, intercept communications in bulk, hack third parties, decrypt files, store DNA or use any other future innovative technology. Also, the national security legislation extends the possibilities for the indiscriminate collection of data, and for the processing, storage and analysis thereof. The process leading to the law includes substantial criticism from the various stakeholders involved. Upon publication of this report, an official consultative referendum is being organized on the new act. The aim of this policy brief is to provide an international audience with a comprehensive overview of the most relevant aspects of the act and its context. In addition, there is considerable focus on the checks and balances as well as the bottlenecks of the Dutch intelligence gathering reform. The selection of topics is based on the core issues addressed during the parliamentary debate and on the authors’ insights.
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This manifesto describes the notion of sustainable development according to its basic appeal for economic, social and environmental value-creation, together with the implications of its meaning at the level of the individual (the manager), the organisation (the business) and society. As sustainable tourism is focused on the long term, foresight is used to develop four scenarios for a sustainable tourism industry in 2040: “back to the seventies”, “captured in fear”, “unique in the world”, and “shoulders to the wheel”. The implications of the scenarios are mapped for four distinct types of organisational DNA: the blue organisation focusing on quality, professionalism and efficiency, the red organisation for whom challenge, vision and change are most important, the yellow organisation addressing energy, optimism and growth, and the green organisation which is led by care, tradition and security. The manifest concludes with strategic propositions for tourism organisations in each of the four business types and each of the four scenarios.
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Abstract Aims: To identify crucial programme characteristics and group mechanisms of, and lessons learned from hindrances in an empowerment programme for certified nursing assistants and contribute to the development of similar programmes in other care settings. Design: Exploratory qualitative study. Methods: Between May 2017 and September 2020, we used in-depth interviews and participant observations to study four groups participating in an empowerment programme for certified nursing assistants (N = 44). Results: We identified three crucial empowerment-enhancing programme characteristics: (1) inviting participants to move outside their comfort zone of caregiving; (2) stimulating the use of untapped talents, competencies and interests; (3) supporting the rediscovery of participants' occupational role and worth. Crucial group mechanisms encompassed learning from and with each other, as well as mechanisms of selfcorrection and self-motivation. Hindrances included a perceived lack of direction, and a lack of organizational support and facilitation. Conclusion: We showed the significance of creating an inviting and stimulating environment in which participants can explore and function in ways they otherwise would not. Likewise, we identified how this can help participants learn from, critically correct and motivate one another. Impact: The programme under study was uniquely aimed to empower certified nursing assistants. Our insights on crucial programme characteristics and group mechanisms may benefit those who develop empowerment programmes, but also policymakers and managers in supporting certified nursing assistants and other nursing professions in empowerment endeavours. Such empowerment may enhance employee retention and make occupational members more likely to address challenges affecting their occupational group and the long-term care sector
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Abstract Aims: To identify crucial programme characteristics and group mechanisms of, and lessons learned from hindrances in an empowerment programme for certified nursing assistants and contribute to the development of similar programmes in other care settings. Design: Exploratory qualitative study. Methods: Between May 2017 and September 2020, we used in-depth interviews and participant observations to study four groups participating in an empowerment programme for certified nursing assistants (N = 44). Results: We identified three crucial empowerment-enhancing programme characteristics: (1) inviting participants to move outside their comfort zone of caregiving; (2) stimulating the use of untapped talents, competencies and interests; (3) supporting the rediscovery of participants' occupational role and worth. Crucial group mechanisms encompassed learning from and with each other, as well as mechanisms of self-correction and self-motivation. Hindrances included a perceived lack of direction, and a lack of organizational support and facilitation. Conclusion: We showed the significance of creating an inviting and stimulating environment in which participants can explore and function in ways they otherwise would not. Likewise, we identified how this can help participants learn from, critically correct and motivate one another. Impact: The programme under study was uniquely aimed to empower certified nursing assistants. Our insights on crucial programme characteristics and group mechanisms may benefit those who develop empowerment programmes, but also policymakers and managers in supporting certified nursing assistants and other nursing professions in empowerment endeavours. Such empowerment may enhance employee retention and make occupational members more likely to address challenges affecting their occupational group and the long-term care sector.
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Matrix-assisted laser desorption/ionisation time of-flight mass spectrometry (MALDI-TOF MS) is a fast and reliable method for the identification of bacteria from agar media. Direct identification from positive blood cultures should decrease the time to obtaining the result. In this study, three different processing methods for the rapid direct identification of bacteria from positive blood culture bottles were compared. In total, 101 positive aerobe BacT/ALERT bottles were included in this study. Aliquots from all bottles were used for three bacterial processing methods, i.e. the commercially available Bruker's MALDI Sepsityper kit, the commercially available Molzym's MolYsis Basic5 kit and a centrifugation/washing method. In addition, the best method was used to evaluate the possibility of MALDI application after a reduced incubation time of 7 h of Staphylococcus aureus- and Escherichia coli-spiked (1,000, 100 and 10 colony-forming units [CFU]) aerobe BacT/ALERT blood cultures. Sixty-six (65%), 51 (50.5%) and 79 (78%) bottles were identified correctly at the species level when the centrifugation/washing method, MolYsis Basic 5 and Sepsityper were used, respectively. Incorrect identification was obtained in 35 (35%), 50 (49.5%) and 22 (22%) bottles, respectively. Gram-positive cocci were correctly identified in 33/52 (64%) of the cases. However, Gram-negative rods showed a correct identification in 45/47 (96%) of all bottles when the Sepsityper kit was used. Seven hours of pre-incubation of S. aureus- and E. coli-spiked aerobe BacT/ALERT blood cultures never resulted in reliable identification with MALDI-TOF MS. Sepsityper is superior for the direct identification of microorganisms from aerobe BacT/ALERT bottles. Gram-negative pathogens show better results compared to Gram-positive bacteria. Reduced incubation followed by MALDI-TOF MS did not result in faster reliable identification.
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