And there are the all the rain water tests where man-made aluminum is found. I'm slowly making my way through the Chemtrails Exposed: A New Manhattan Project book. Definitely good stuff to keep in mind if you plan to follow this on blogs. Interesting, they say the barium could be used as a radioactive tracer and that by measuring the decay they can track the full life cycle of the material. I wonder if that could be used to test the air to see which days the air is clean..