Just recently a team of scientists from the University of Valencia have proven that traces of blood at a crime scene can be eliminated completely when exposed to active oxygen. The main objective of a criminal is to not get caught, so they will try everything in their path to succeed, with the motivation to remain free, criminals have come up with a new way to beat forensic scientists at their own game. Using active oxygen, criminals smuther the blood evidence, causing a chemical reaction that prevents forensic scientists from successfully testing for the presence of blood. It is hypothesized that the active oxygen products contain sodium percarbonate that, when dissolved in water cause a considerable quantity of hydrogen peroxide (oxygenated water) is released. This reaction then causes the "depletion" of haemoglobin in attempt to eliminate the peroxide. With this reaction having occured, police scientists are no longer able to discover the traces of blood using reagents such as luminol, phenophthalene, or the human haemoglobin test.
In time the cycle will repeat itself; scientists will discover a new way to test for the presence of blood and eventually criminals will find away to eliminate the evidence. This game of cat and mouse will always continue, however, it will just become harder and harder to win.
http://www.sciencedaily.com/releases/2009/02/090217112516.htm
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