That may be so, but that doesn't mean that the food can legally be contaminated. The agreement requires that all food meet international requirements for safety and sanitation. At the end of the day, that's all you can do. If some farmers in Mexico don't follow the rules, it's no different than some farmers in the US not following the rules.
The fact remains that under the NAFTA, the US has the power to block imports of food and agricultural products that don't meet international standards.
That will come as a shock to some of the Birchers here. [chuckle]
I remember a thread from a while back where somebody claimed the the U.S. was prevented by NAFTA from policing the safety of its food supply.
You expect corrupt Mexico to follow the rules? We have had cantaminated cantelopes, strawberries, green onions and now candy with lead in it in the US. All from NAFTA and Mexico. Mad cow disease from Canada. Tell me about these countries following the rules.