Impact of several wearers on the persistence of DNA on clothes—a study with experimental scenarios

Poetsch, Micaela; Pfeifer, Manuel; Konrad, Helen; Bajanowski, Thomas; Helmus, Janine

doi:10.1007/s00414-017-1742-z

Cited by 23 publications

(15 citation statements)

References 27 publications

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“…Profile interpretation showed that whilst in most of samples the office owner was the only or the major/majority contributor to the samples, the temporary occupier was detected as a major/majority contributor on several items in both laboratories, despite the relatively shorter duration of use ( Table 2). Detection of the last person temporarily touching or using an item or space, in differing degrees relative to the previous handler/owner, concurs with findings of previous studies [8][9][10][11][12][13][14]. Several of the samples where the temporary occupier was a major/majority contributor were from relatively small surface areas, suggesting that with prolonged use, the DNA of the owner may be more readily removed and replaced with the DNA of the temporary occupier.…”

Section: Discussionsupporting

confidence: 86%

“…While the DNA proportions of the last user and the owner of the item (if the last user and the owner are two different people) has been investigated for commonly used items [8][9][10][11][12][13][14], there are a number of other scenarios that require further investigation. A common scenario where this may be relevant involves a person (or a few people) temporarily occupying a space known to be predominantly occupied by a single person (or a few people), in the absence of the original occupant (s) e.g.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

DNA detection of a temporary and original user of an office space

Goray

Kokshoorn

Steensma

et al. 2020

Forensic Science International: Genetics

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Section: Discussionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

DNA detection of a temporary and original user of an office space

Goray

Kokshoorn

Steensma

et al. 2020

Forensic Science International: Genetics

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“…van Oorschot and Jones [26] observed that substantial transfer of DNA material occurs during initial contact. Findings of others [18,60,120] concur with these observations. One may predict that there will be some accumulation of DNA on an object due to increased duration or frequency of contact.…”

Section: Manner Of Contact / Handlingsupporting

confidence: 80%

“…The peak height ratios of victim to background ranged from 0.7 to 29.8, and of grabber to background from 0.6 to 14.7. -Poetsch et al [120] found that of 84 sweat bands, sampled separately from the inside and outside, worn for 4 h to 3 days by a first wearer, followed by 10 min to 3 days by a second wearer, 92.9% provided a mixture profile containing both wearers. A single source profile of the first wearer was observed in only one sample.…”

Section: Persistence Of Original User After Use By Anothermentioning

confidence: 99%

DNA transfer in forensic science: A review

Oorschot

Szkuta

Meakin³

et al. 2019

Forensic Science International: Genetics

227

130

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Understanding the variables impacting DNA transfer, persistence, prevalence and recovery (DNA-TPPR) has become increasingly relevant in investigations of criminal activities to provide opinion on how the DNA of a person of interest became present within the sample collected. This review considers our current knowledge regarding DNA-TPPR to assist casework investigations of criminal activities. There is a growing amount of information available on DNA-TPPR to inform the relative probabilities of the evidence given alternative scenarios relating to the presence or absence of DNA from a specific person in a collected sample of interest. This information should be used where relevant. However, far more research is still required to better understand the variables impacting DNA-TPPR and to generate more accurate probability estimates of generating particular types of profiles in more casework relevant situations. This review explores means of achieving this. It also notes the need for all those interacting with an item of interest to have an awareness of DNA transfer possibilities post criminal activity, to limit the risk of contamination or loss of DNA. Appropriately trained forensic practitioners are best placed to provide opinion and guidance on the interpretation of profiles at the activity level. However, those requested to provide expert opinion on DNA-related activity level issues are often insufficiently trained to do so. We advocate recognition of DNA activity associated expertise to be distinct from expertise associated with the identification of individuals. This is to be supported by dedicated training, competency testing, authorisation, and regular fit for purpose proficiency testing. The possibilities for experts to report on activity-related issues will increase as our knowledge increases through further research, access to relevant data is enhanced, and tools to assist interpretations are better exploited. Improvement opportunities will be achieved sooner, if more laboratories and agencies accept the need to invest in these aspects as well as the training of practitioners.

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“…Even though the principal aspects of “Touch DNA” have been extensively studied 10–13 , to date, there are few reports in the research field of DNA retrieval from garments that have been worn 14–21 . In criminal cases, sampling techniques are very important to collect the best evidence.…”

Section: Introductionmentioning

confidence: 99%

Touch DNA: impact of handling time on touch deposit and evaluation of different recovery techniques: An experimental study

Sessa

Salerno

Bertozzi

et al. 2019

Sci Rep

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“Touch DNA” is DNA obtained from biological material transferred from a donor to an object or a person during physical contact. This particular kind of evidence could play an essential role in forensic laboratory work and is considered an important tool for investigators. Even though the principal aspects of “Touch DNA” have been extensively studied, to date, there are few reports in the research field of DNA retrieval from garments that have been worn. This study aimed to investigate the “handling time”, analyzing particularly the minimum contact time required to deposit a sufficient amount of DNA on a garment to produce an interpretable profile of the “handler”. Moreover, three different sampling techniques were compared (“dry swab”, “cutting out”, and “adhesive tape”) with the aim of defining the technique that guarantees the best recovery of the three methods tested. Analyzing the data of this experimental model, a “handling time” of two seconds is enough to release sufficient DNA on to a garment to obtain a complete profile. Moreover, this study demonstrated that when targeting for foreign DNA, the sample area should be narrowed down as much as possible to the smallest area possible to maximize target DNA recovery.

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Impact of several wearers on the persistence of DNA on clothes—a study with experimental scenarios

Cited by 23 publications

References 27 publications

DNA detection of a temporary and original user of an office space

DNA detection of a temporary and original user of an office space

DNA transfer in forensic science: A review

Touch DNA: impact of handling time on touch deposit and evaluation of different recovery techniques: An experimental study

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