> This is where a purely libertarian position tends to run into trouble You're right that outlawing free markets -- such as banning Politically Unpopular Drugs

> This is where a purely libertarian position tends to run into trouble You're right that outlawing free markets -- such as banning Politically Unpopular Drugs -- can cause problems for free markets. :) Similarly, if selling books becomes a crime, and you buy books on the black market, it may become more difficult to verify claims about the paper used in the printing process coming from renewable resources. The problem lies not in the claim about renewability, but in the underlying book ban. Perhaps we can conclude from this that processes relying on free markets may not work as well if markets aren't free? Remember that libertarians != anarchists; I've never seen a libertarian marching in the streets against laws in their state or province designed to prevent fraudulent claims about fair trade coffee or renewable forests.