Originally Posted by
crazycliff200843
I, too, have wondered about contrails and their longevity. I don't know if it is true or not, but I have heard that chemicals are sometimes used for weather predicting purposes. It is supposed to make it easier to track cloud and wind formations at different altitudes when it is hard to see through different layers of the atmosphere. Again, I have no idea about the correctness of that statement. It makes some sense to me, though, as they would be able to collect data from a line a mile wide rather than data from a line going straight up, like with a weather baloon.
As far as doping the general public from that altitude, there just aren't enough chemicals in a contrail to do it. Not to mention that the chemicals would be miles away before they reached the ground, if they reached the ground.