evidence: A state senator relates a bill to "chemtrails," a conspiracy theory related to the lines of vapor coming from jet planes [...] Sen. Steve Southerland, a Morristown Republican who initiated the legislation, didn’t mention "chemtrails" when he passed the bill on the Senate floor last week. [...] David Keith’s Research Group with Harvard University describes "chemtrails" as a conspiracy theory that governments and other groups are running a secret program to add "visible plumes" containing toxic chemicals to the atmosphere, similar to contrails or vapor trails released by aircraft engine exhaust that are made up mainly of water in the form of ice crystals.