Supreme Court takes sledgehammer to federal agency power in Chevron case 

The Supreme Court took a sledgehammer to executive agencies’ power Friday by overruling a prominent precedent that bolstered their ability to implement regulations in wide areas of American life, including consumer and environmental protections.

In an 6-3 decision along ideological lines, the Supreme Court’s conservative majority upended a 40-year administrative law precedent that gave agencies across the federal government leeway to interpret ambiguous laws through rulemaking.

Known as Chevron deference, the now-overturned legal doctrine instructed judges to defer to agencies in cases where the law is ambiguous.

Now, judges will substitute their own best interpretation of the law, instead of deferring to the agencies — effectively making it easier to overturn regulations that govern wide-ranging aspects of American life.

This includes rules governing toxic chemicals, drugs and medicine, climate change, artificial intelligence, cryptocurrency and more.

“Chevron is overruled,” wrote Chief Justice John Roberts, joined by his five conservative colleagues.

“Courts must exercise their i...