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A Novel Tape Lifting System for the Retrieval of Trace Evidence From Crime Scenes

机译：从犯罪现场检索痕量证据的新型胶带提升系统

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Adhesive-coated transparent tapes have long been used as the tool of choice when recovering trace evidence from a variety of surfaces [1-3]. These tapes have a number of key advantages. These include their ability to readily isolate evidentially valuable materials from the substrate on which they are found and the fact that these materials can be easily secured by adhering the tape to a suitable backing, such as an acetate sheet. The transparency of these tapes also means that low-power microscopy can be used to search for trace items that may be adhered to them [4]. Such items have the potential to provide evidence of contact between the perpetrator and/or victim of a crime and the surface from which such items have been recovered. The use of tapes to recover trace evidence is frequently referred to as tape lifting and the tapes once used for this purpose and secured to a backing are known as tape lifts. Conventional tape lifts have the disadvantage that they are birefringent, making them incompatible with polarising light microscopy (PLM). Also, items recovered on tape lifts are typically surrounded by minute air bubbles, making the microscopic characterisation of their morphological features problematic. The current solution to these problems is to remove the items of potential value prior to their full characterisation. For example, it is common practice to dissect tape lifts to isolate fibres of evidential interest and then mount these on glass slides prior to examination using PLM. This is a very time-consuming [5] and, consequently, expensive process and one which increases the opportunities for evidence loss and contamination.
机译：长期以来，从各种表面回收痕迹证据时，涂有胶粘剂的透明胶带一直被用作选择的工具[1-3]。这些磁带具有许多关键优势。这些包括它们容易从发现它们的基底上分离出明显有价值的材料的能力，以及通过将胶带粘附到合适的背衬例如乙酸酯片上可以容易地固定这些材料的事实。这些胶带的透明性还意味着可以使用低倍显微镜来搜索可能粘附在其上的痕迹项目[4]。这些物品有可能提供证据，证明犯罪者和/或犯罪受害人与从中找到这些物品的表面接触。使用胶带来回收痕量证据通常被称为胶带提举，而曾经用于此目的并固定在背衬上的胶带被称为胶带提举。常规的胶带升降机具有双折射的缺点，使其与偏振光显微镜（PLM）不兼容。而且，在磁带升降机上回收的物品通常被微小的气泡包围，从而使其形态特征的微观表征成为问题。这些问题的当前解决方案是在完全鉴定潜在价值的项目之前将其删除。例如，通常的做法是解剖胶带升降机以分离出具有明显意义的纤维，然后在使用PLM检查之前将其安装在载玻片上。这是一个非常耗时的过程[5]，因此是昂贵的过程，并且增加了证据丢失和污染的机会。

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