I read this very interesting article Plants With Soul by Michael Posner in the summer reading issue of a magazine called Walrus. It all sounded pretty familiar for some reason and was revealed to have been based (at least in part) upon a good book I read a few years back called The Cosmic Serpent, DNA and the origins of Knowledge.
The Plants with Soul article provides a good synopsis of The Cosmic Serpent as well as detailing a few other notable authors and how a psychoactive drug, ayahuasca, made it all the way to the US supreme court. The 7 pages cover a breadth of material, ranging from personal anecdotes on ayahuasca ceremonies and experiences, and information on the Brazillian based church United Beneficient Spiritual Union of the Plants (UDV) and their legal battle with the US supreme court to use ayauasca in their ceremonies.
download link after the jump
The article is worth reading from the ayauasca journies alone so I have photographed the article and put it into PDF format for your viewing pleasure.