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The assertion that the government is spraying noxious chemicals on its own people from high flying military aircraft needs some real substantiation than just reports of seeing contrails in the sky and claiming they are making people sick. While there have been reports of similar activity in the past, merely seeing a jet contrail in the sky does not prove anything.
Persistence of contrails is neither an indication that they contain some kind of chemical, nor that it is some kind of sprays. As a matter of fact, sailors have known for years to look specifically at the patterns and persistence of jet contrails for weather forecasting. If a jet is flying through air at altitude with a low humidity, the moist air from the jet engine might produce a slight, short-lived contrail. These short-lived contrails are a sign that the weather will be fair. A thick, long-lasting contrail indicates humid air high in the atmosphere, and can be an early sign of a storm:
Several scientific studies are also being conducted with respect to contrail formation and their climatic effects. "Cirrus clouds affect Earth's climate by reflecting incoming sunlight and inhibiting heat loss from the surface. Ordinarily, cirrus clouds are only weakly influenced by most ground-based human activities, because of their high altitude. However, increasing levels of high-altitude jet air traffic may alter the regional climatic effects of cirrus because aircraft condensation trails (contrails) often produce new cirrus, which could differ in their radiate properties."
For example, SUCCESS (SUbsonic aircraft Contrail & Clouds Effects Special Study) is a NASA field program using scientifically instrumented aircraft and ground based measurements to investigate the effects of subsonic aircraft on contrails, cirrus clouds and atmospheric chemistry
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