Although many assume that arson investigations are based on hard science, the May 7, 2010 episode of 20/20 pointed out numerous flaws with arson science. The investigation revealed that many assumptions made by arson investigators are based on word of mouth rather than scientific analysis. Examples included conclusions of points of origin, the use of accelerants, the effect of man-made fires on glass, and the typical behavior of fire. The investigation brought to light several cases where the defendant was convicted based on faulty arson evidence.
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