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so what youre telling me is that setting someone on fire with hydrogen is the perfect crime.

Or methanol (under the right circumstances): "Pure alcohols burn with a nearly invisible flame in daylight." (http://www.energyquest.ca.gov/transportation/alcohols.html)

Which was done in (yeah, I know) an episode of CSI:Miami: http://csimiami.wetpaint.com/page/207:Grand+Prix

Though, of course, hydrogen is far more exciting.