Are 'Chemtrails' a form of Government suppression?

     A contrail is the expected exhaust excretion expelled from jet engines behind a plane. Different kinds of engines give different forms and durations, though a contrail is still generally expected to dissipate within a certain distance from the plane or within a few minutes or less of the aircraft's passage. There are many trails made by planes that leave much longer and more permanent lines, however, some of which expand outward to imitate cirrus clouds. Many scientists and skeptics argue that these are just forms of weather modification, put other scientific and civilian proponents of government conspiracy insist that these other exhaust patterns are 'chemtrails,' including a more sinister but unknowable chemical or biological agent for undisclosed reasons. How possible is this?

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