Parliament has unanimously approved a call for Ottawa to oppose a multi-million dollar legal challenge by Dow AgroSciences against a Quebec ban on use of 2,4-D in the province.In 2003, the Quebec government enacted a pest management code that it has used to ban use of the popular chemical because of studies that conclude it is a public health hazard. NAFTA chapter 11 gives American companies the right to challenge domestic laws and regulations that do not treat them the same as national corporations