1 Introduction</h5> The transfer of DNA to a crime scene or items related to the crime event can happen in several ways. Transfer may be described as “active” or “passive”  . Active transfer of DNA traces originating from the perpetrator occurs during the crime event itself; DNA is transferred via direct contact or aerosol e.g. from saliva spray to the surroundings. Passive transfer can be completely unrelated to the crime-event. Via this route, DNA can be transferred to crime related objects by a vector (secondary transfer) or by aerosol transfer of cells already present in the surroundings (e.g. in house-dust). Because there is an unfortunate tendency, to associate a crime-stain profile with direct evidence of the crime-activity, there are considerable dangers associated with lack of understanding of the various risks of alternative (innocent) means of transfer. This concern is gaining increased attention. Several studies have been conducted to investigate secondary transfer [2–5] . Goray et al.  found that the types of primary and secondary substrates, the level of moistness of the sample and the manner of contact, all played important roles in transfer of DNA. The initial deposit of DNA must be of sufficient quantity and
Forensic Science International: Genetics – Elsevier
Published: Jul 1, 2015
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