A federal judge overseeing the multidistrict litigation over the opioid epidemic has ordered lawyers to disclose all third-party financing arrangements in their cases.

On Monday, U.S. District Judge Dan Polster of the Northern District of Ohio, who is overseeing hundreds of lawsuits brought by governmental entities against the manufacturers and distributors of opioids, ordered lawyers working on contingency to submit a letter identifying the financing for in camera review. He also ordered each lawyer and lender to submit sworn affirmations stating that the financing does not create any conflicts of interest, “undermine counsel’s obligation of vigorous advocacy,” affect the lawyer’s judgment, give the lender “control over litigation strategy or settlement decisions,” or affect the litigant’s control of the settlement.