Motley Rice, facing possible disqualification from dozens of opioid lawsuits, has turned to the latest formal opinion about the American Bar Association’s professional conduct rule governing ethics guidance for government lawyers.

OptumRx Inc., a pharmacy benefit manager and defendant in the opioid lawsuits, is attempting to disqualify Motley Rice, which it says previously obtained confidential information from the company while serving as outside counsel to Hawaii, the District of Columbia and Chicago. Motley Rice has insisted there is no conflict, but a federal judge in the opioid multidistrict litigation wanted more information about the firm’s representations.