Abstract
Advance in forensic DNA analysis has made it possible to analyze even biological traces invisible to the naked eye, such as skin abrasions. As latent traces include the risk of being overlooked, often large areas are sampled. Unfortunately, this approach includes the danger of a contamination and very often generates mixed DNA profiles, which are associated with disadvantages. This study presents a new dyeing technique which enables a controlled analysis of latent biological traces. By a series of experiments the limitations and possible effects on subsequent STR analysis were examined. On staged exhibits the efficiency of the screening aid was again tested and the usability of the new procedure demonstrated.
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