The Chemtrail conspiracy theory holds that the trails seen behind some aircraft are not ordinary contrails, but are the result of high-altitude spraying of some kind of chemicals or biological agents for a purpose undisclosed to the general public. Versions of the conspiracy theory circulating on the Internet and on radio talk shows hold that they are toxic substances deliberately sprayed from flying aircraft into the atmosphere by government officials, and federal agencies have received thousands of complaints from people demanding an explanation. The many versions of rumors circulating allege different chemical or biological compositions and purposes behind the aerial spraying, but there is no evidence that they are anything but normal aircraft contrails consisting of water vapor and ice crystals. Officials from four agencies in the United States jointly published a fact sheet to refute the rumors and to explain the science of contrail formation. this is footage that was taken in Las Vegas Nevada on February 28th, 2008. the band is named Catch 22 and the song is called A Minor Point.