NAFTA violation involving MAD COW

[Postman]

In a new report, NAFTA Chapter 11 Investor-State Cases: Lessons for the Central America Free Trade Agreement, Public Citizen describes how Canadian cattle producers are using NAFTA to demand $300 million in compensation from U.S. taxpayer funds, claiming that the Canadian cattle import ban instituted after mad cow disease was found in Canada violates their NAFTA rights.

http://www.citizen.org/hot_issues/issue.cfm?ID=1004

just as an aside....why isn't the Bush ban on re-importation of prescription drugs from Canada a violation of NAFTA? Could it be because NAFTA was never intended to be consumer friendly legislation, it's intent is for the benefit of corporations?