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An arsonist's M.O. can be reverse-engineered from a crime scene by piecing together clues found among the ashes. Fire engineers say just traces of flammable liquid or any container found where the fires started are all that's needed to reveal distinct chemical fingerprints back at the lab. Meanwhile computer models can test numerous ignition scenarios using details of the torched building's structure. Virtual outcomes are compared to actual blazes. Such information may give investigators clues about the people behind these crimes, and the scientific evidence necessary to make charges stick. With the National Academy of Engineering, Randy Atkins, WTOP Radio.