International trade deals like the Trans-Pacific Partnership (TPP) need to be carefully examined piece by piece because they can take precedence over a country’s own laws.

Case in point: the World Trade Organization (WTO) on Friday ruled that dolphin-safe tuna labeling rules — required by U.S. law, in an effort to protect intelligent mammals from slaughter — violate the rights of Mexican fishers.

As a result, the U.S. will have to either alter the law or face sanctions from Mexico.

I wrote a few weeks ago about how the “investor-state dispute settlement system” baked into trade agreements can force countries to compensate corporations when regulations cut into their profits.

The long-running quarrel over tuna reveals another way that domestic laws can be overturned by trade agreements: when countries can file trade challenges on behalf of domestic industries.

“This should serve as a warning against expansive trade deals like the Trans-Pacific Partnership that would replicate rules that undermine safeguards for wildlife, clean air, and clean water,” said the Sierra Club’s Ilana Solomon in a statement.

In the Marine Mammal Protection Act (MMPA) of 1972, the United States banned importation of yellowfin tuna harvested with netting that also scooped up dolphins, which often swim in the eastern Pacific Ocean above yellowfin schools. Since the 1950s, millions of dolphins have been killed in the tuna fishing trade, but the MMPA resulted in significant reductions in dolphin deaths.

Mexico, which has more lax fishing standards than the U.S., launched trade challenges in 1990 to overturn the import ban. Other nations piled on to the trade challenges, seeking to force the U.S. to change its dolphin conservation practices.

…click on the above link to read the rest of the article…