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Luminol was used to detect the presence of blood at the cottage and it is the most sensitive blood detection technique commonly used by forensic investigators. Luminol was has been found to be five times more sensitive than TMB (Tetramethylbenzidine). This explains why the TMB tests yielded negative results.Furthermore, forensic investigators who regularly work on crime scene can easily distinguish between the bright blue glow of a blood trace and the much fainter glow of other reactive substances.It should also be noted that reactive substances also produce different colour spectrums. For example, it is straightforward to distinguish between blood and bleach. The luminol couldn’t have been reacting to bleach anyway because bleach dissipates after a couple of days and there will be no trace left. The luminol tests at the cottage were carried out on 18 December 2007.
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