![]() ![]() ![]() Similarly, Fluorescein is based on the heme-accelerated oxidation of fluorescin to fluorescein, though requires an alternate light source to visualise the change. Luminol, perhaps the most well-known presumptive test, results in a distinctive blue luminescence in the presence of blood, based on the oxidation of luminol by haemoglobin. Initially presumptive tests may be used at a crime scene to establish whether a suspected stain is in fact blood. Due to the obvious importance of blood in a forensic context, a range of tests for identifying blood has been developed. Undoubtedly the most common body fluid of interest encountered at crime scenes, blood is primarily composed of water, along with blood cells, proteins, minerals, hormones, glucose and many metabolites. Unfortunately there is no single method for the analysis of all body fluids, and it may be necessary to employ multiple techniques depending on the type of biofluid. Once potential biofluids are located in-situ, presumptive tests may be used to indicate the possible identity of the stain, and following sample collection confirmatory analysis and DNA analysis will often be conducted. However the use of alternative light sources will not typically allow for differentiation between different body fluids. An ALS utilises different wavelengths of light to visualise otherwise invisible or ambiguous stains, with some even having the ability to show stains that have been wiped clean or covered by paint. Visualisation techniques may be employed at an incident scene to initially locate potential body fluids, for instance alternative light sources (ALS). Unfortunately, body fluid analysis can be a lengthy process. The presence of body fluids, their location and DNA profile obtained from them can supply police agencies with a wealth of information to aid the investigation. ![]() The detection and identification of body fluids at a crime scene can provide essential information as to the events which may have occurred and the people involved. ![]()
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