 Mary Thomas saying, effectively, the Supreme Court saying enough is enough, no more Chevron deference. The ruling today, the majority decision written by Chief Justice John Roberts, essentially kills Chevron deference. The court acknowledged that in order to make sure that lower courts weren't utilizing that standard, in order to make sure that agencies no longer felt like they could utilize that standard, they needed to kind of formally put an end to the concept of Chevron deference.