Iacobucci wrote a dissent, which was joined by Justices Cory and Sopinka. Iacobucci agreed with the majority that the declaratory power only extended to matters that were "integral to the federal interest in the work". He found that this was consistent with general approach to constitutional interpretation where no head of power had the power to subsume the other. Iacobucci disagreed with the majority that labour relations of the plant's employees were integral to the effective regulation of the plants. From reading the preamble there is no indication that labour was to be included, which said that the federal interest was for the safety, health and security concerns. Labour relations only aims at "industrial peace" and better working conditions for employees, which is not directly related to the plant. This is supported by section 92A of the Constitution Act, 1867. If Parliament wants to include labour relations they could easily do so with their declaratory power. Iacobucci also found that the p.o.g.g. power does not include labour relations. He emphasized the application of "balancing principles" between the two heads of power. He held that labour relations for plant employees was not part of a "single, distinctive, and indivisible matter identified as atomic energy." See also List of Supreme Court of Canada cases (Lamer Court) External links Canadian federalism case law Supreme Court of Canada cases Labour relations in Canada Canadian labour case law 1993 in Canadian case law