Recent Supreme Court decisions curbing the power of federal agencies will hobble government efforts to protect public health, legal experts warn. The rulings will make it harder for some federal agencies to bring enforcement actions, give judges more leeway to second-guess agency decisions, and following a July 22, 2024, decision, make it easier to challenge long-settled regulations. Legal experts and health officials expect a gusher of litigation that will complicate the regulation of drugs, tobacco products, and cutting-edge medical technologies. The administration of government health insurance programs could be further mired in lawsuits, and decades-old agency decisions may be newly vulnerable to challenges.