These documentaries detail just a small part of the history of military and government testing against American citizens. This should be a wake-up call for those on the fence about chemtrails. And yes, this is legal.
Note: NZ is not exempt from these activities. Witness: https://envirowatchrangitikei.wordpress.com/2017/01/29/censored-from-nz-television-ivor-watkins-dows-release-of-deadly-245t-from-1962-81-in-new-plymouth/