The main problem with chemtrails as I see it is that the government refuses to acknowledge their existence as anything other than normal jet contrails.
A normal contrail happens at heights of 30,000 feet and above, and dissipates very quickly whereas chemtrails are usually at a level of 10,000 feet or below and spread out to form cloud coverings.
I live in Georgia, but spent last week in northeastern Arkansas, and saw many chemtrails. One in particular above the house I was staying at was done by a plane turning on and off the spraying to make an "X"...but this one had three lines crossing each other in the center. I tried to take pictures with my digital camera but it was too dark outside.
When I saw the spraying, I went indoors and the funny thing was that a few hours later my friend came home and must have breathed in some of the spray because the next day she had difficulty breathing and sounded as if she were catching a cold. Could have been a coincidence, but I was fine.