There is an air force whistleblower who came out who was in public health and frequently tested soil samples in various areas of the nation. She stated that there were extremely high levels of agents that were then found in the jet fuel itself when tested. There was no reason for these other agents to be in the fuel.
Here is a link to the story: http://www.veteranstoday.com/2014/01/30/ex-military-chemtrails-whistleblower/