The U.S. Supreme Court adopted a Special Master's determination that Nebraska "knowingly failed" to comply with its obligations under a 2002 settlement agreement that resolved an underlying water allocation dispute between Nebraska and Kansas. The settlement established mechanisms to accurately meas...

The Ninth Circuit upheld the dismissal of a trucking association's federal preemption challenge to a California environmental regulation on diesel trucks. The regulation requires heavy-duty diesel trucks, whose emissions contribute significantly to particulate matter and ozone pollution, to be upgra...