Separation of visibly-excited fluorescent components in fingerprint residue by thin-layer chromatography

The use of lasers for the detection of fingermarks is widespread in the forensic field. Despite this, and the fact that many studies have been conducted into the composition of fingermark residue, the components responsible for the inherent visible fluorescence remain unidentified. Traditionally compositional studies have been performed on sweat, sebum, or skin surface washes, none of which are truly representative of the situation when a fingerprint is deposited on a surface. In this paper thin-layer chromatography (TLC) has been performed on sebum-rich fingermarks laid directly onto TLC plates and an argon ion laser used to visualize the separated components. It has been found to be a robust and reproducible method for studying the fluorescent components in fingermark residue and is considered to be more realistic than other methods of sample preparation as it eliminates the chances of extraneous matter being extracted from the skin surface. Investigations into the nature of the separated compounds have also been made and the results are reported.     

MI 6's Requirements Directorate: Integrating Intelligence into the Machinery of British Central Government

The following article examines the relationship between the British Secret Intelli-gence Service (SIS, a.k.a. MI 6) and the machinery of central government, particularly departments of state and other agencies which employ information generated by the SIS. It is argued the main link between the SIS and its consumers in British government is the SIS's requirements 'side', embodied throughout most of the post-war era in the form of a Requirements Directorate. The article argues that the Requirements mechanism operates as a line of communication between the SIS and its consumers separate from the Cabinet Office Joint Intelligence Organisation (JIO), although there is overlap and interdependency between the two architectures. This discussion traces the development of the 'requirements side' from the interwar period up to the post-Cold War era using information from archival sources and a programme of interviews with former UK intelligence officials. It is further argued that the structure and process of the SIS 'requirements side' has developed and changed as a consequence of changes in the structure of demand in the machinery of British government, including adapting to the increasingly central role of the JIO. However, despite that increasingly central role of the JIO, the 'requirements side' has continued to serve as the first point of contact between the SIS and its customers in Whitehall.     

Reviews

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