Montana sued OxyContin maker Purdue Pharma LP, withdrawing from a multistate investigation by attorneys general into opioid manufacturers’ marketing practices and joining a growing list of states that have broken off to pursue individual lawsuits.

As U.S. consumer outrage grows over prescription drug prices, state authorities and patient advocates in Maryland are preparing to enforce the nation’s first law designed to punish drugmaker price-gouging.

U.S. Attorney General Jeff Sessions will unveil a major crackdown on healthcare fraud involving opioid treatment programs, Bloomberg News reported, citing two people familiar with the matter.

Missouri became the third U.S. state to accuse major drug manufacturers of fraudulently misrepresenting the risks of opioid painkillers.