Constitutional interpretation wasn't difficult until we started trying to control substances. No one has the right to tell anybody else what they can or can't put into their own body. This kind of freedom has its roots in The Declaration of Independence (which has no influence on U.S. Law for some strange reason) and several of the amendments to the constitution known as The Bill Of Rights, which limits the governments ability to intrude into people's lives (but for some reason has been largely ignored for the past 100 years).
Freedom of religion was one of the main principles upon which this country was founded, and along with that the freedom to practice one's religion with the use of certain substances which allow one to commune with God. The sacred South American herb, Ayahuasca has been know to heal people from physical as well as mental ailments and many people who have used it say it has opened their minds in many ways.
The arrest of Taita Juan Agreda Chindoy, by U.S. customs officials is, in my opinion, an affront to the freedoms held most dear to America, and an attack on the most basic of human freedoms.
If you would like to contribute to his legal fund, you may make a donation at this website: http://www.freetaitajuan.org/
Life, liberty and happiness to all!