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If you are a chemtrail believer, noting said can persuade them away from their beliefs.
If you are a non-believer nothing can be said to persuade you away from your beliefs.
But, contrary to popular belief amongst some circles, said chemicals or what have you, are not being sprayed into our atmosphere as a means of population control or to keep the populous docile and complacent.
The human research programs were usually highly secretive, and in many cases information about them was not released until many years after the studies had been performed.